diff --git a/.devcontainer/devcontainer.json b/.devcontainer/devcontainer.json
new file mode 100644
index 0000000..39c428d
--- /dev/null
+++ b/.devcontainer/devcontainer.json
@@ -0,0 +1,29 @@
+{
+  "name": "Jekyll",
+  "image": "mcr.microsoft.com/devcontainers/jekyll:2-bullseye",
+  "onCreateCommand": "git config --global --add safe.directory ${containerWorkspaceFolder}",
+  "postCreateCommand": "bash .devcontainer/post-create.sh",
+  "customizations": {
+    "vscode": {
+      "settings": {
+        "terminal.integrated.defaultProfile.linux": "zsh"
+      },
+      "extensions": [
+        // Liquid tags auto-complete
+        "killalau.vscode-liquid-snippets",
+        // Liquid syntax highlighting and formatting
+        "Shopify.theme-check-vscode",
+        // Shell
+        "timonwong.shellcheck",
+        "mkhl.shfmt",
+        // Common formatter
+        "EditorConfig.EditorConfig",
+        "esbenp.prettier-vscode",
+        "stylelint.vscode-stylelint",
+        "yzhang.markdown-all-in-one",
+        // Git
+        "mhutchie.git-graph"
+      ]
+    }
+  }
+}
diff --git a/.devcontainer/post-create.sh b/.devcontainer/post-create.sh
new file mode 100644
index 0000000..a4bc282
--- /dev/null
+++ b/.devcontainer/post-create.sh
@@ -0,0 +1,18 @@
+#!/usr/bin/env bash
+
+if [ -f package.json ]; then
+  bash -i -c "nvm install --lts && nvm install-latest-npm"
+  npm i
+  npm run build
+fi
+
+# Install dependencies for shfmt extension
+curl -sS https://webi.sh/shfmt | sh &>/dev/null
+
+# Add OMZ plugins
+git clone https://github.com/zsh-users/zsh-syntax-highlighting.git ~/.oh-my-zsh/custom/plugins/zsh-syntax-highlighting
+git clone https://github.com/zsh-users/zsh-autosuggestions ~/.oh-my-zsh/custom/plugins/zsh-autosuggestions
+sed -i -E "s/^(plugins=\()(git)(\))/\1\2 zsh-syntax-highlighting zsh-autosuggestions\3/" ~/.zshrc
+
+# Avoid git log use less
+echo -e "\nunset LESS" >>~/.zshrc
diff --git a/.editorconfig b/.editorconfig
new file mode 100644
index 0000000..2b740bf
--- /dev/null
+++ b/.editorconfig
@@ -0,0 +1,19 @@
+root = true
+
+[*]
+charset = utf-8
+indent_style = space
+indent_size = 2
+trim_trailing_whitespace = true
+# Unix-style newlines with a newline ending every file
+end_of_line = lf
+insert_final_newline = true
+
+[*.{js,css,scss}]
+quote_type = single
+
+[*.{yml,yaml}]
+quote_type = double
+
+[*.md]
+trim_trailing_whitespace = false
diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..262d6bd
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,16 @@
+# Set default behavior to automatically normalize line endings.
+* text=auto
+
+# Force bash scripts to always use LF line endings so that if a repo is accessed
+# in Unix via a file share from Windows, the scripts will work.
+*.sh text eol=lf
+
+# Force batch scripts to always use CRLF line endings so that if a repo is accessed
+# in Windows via a file share from Linux, the scripts will work.
+*.{cmd,[cC][mM][dD]} text eol=crlf
+*.{bat,[bB][aA][tT]} text eol=crlf
+
+# Denote all files that are truly binary and should not be modified.
+*.png binary
+*.jpg binary
+*.ico binary
diff --git a/.github/workflows/pages-deploy.yml b/.github/workflows/pages-deploy.yml
new file mode 100644
index 0000000..cc28f99
--- /dev/null
+++ b/.github/workflows/pages-deploy.yml
@@ -0,0 +1,73 @@
+name: "Build and Deploy"
+on:
+  push:
+    branches:
+      - main
+      - master
+    paths-ignore:
+      - .gitignore
+      - README.md
+      - LICENSE
+
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+# Allow one concurrent deployment
+concurrency:
+  group: "pages"
+  cancel-in-progress: true
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+          # submodules: true
+          # If using the 'assets' git submodule from Chirpy Starter, uncomment above
+          # (See: https://github.com/cotes2020/chirpy-starter/tree/main/assets)
+
+      - name: Setup Pages
+        id: pages
+        uses: actions/configure-pages@v4
+
+      - name: Setup Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: 3.3
+          bundler-cache: true
+
+      - name: Build site
+        run: bundle exec jekyll b -d "_site${{ steps.pages.outputs.base_path }}"
+        env:
+          JEKYLL_ENV: "production"
+
+      - name: Test site
+        run: |
+          bundle exec htmlproofer _site \
+            \-\-disable-external \
+            \-\-ignore-urls "/^http:\/\/127.0.0.1/,/^http:\/\/0.0.0.0/,/^http:\/\/localhost/"
+
+      - name: Upload site artifact
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: "_site${{ steps.pages.outputs.base_path }}"
+
+  deploy:
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    runs-on: ubuntu-latest
+    needs: build
+    steps:
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..0082d90
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,27 @@
+# Bundler cache
+.bundle
+vendor
+Gemfile.lock
+
+# Jekyll cache
+.jekyll-cache
+.jekyll-metadata
+_site
+
+# RubyGems
+*.gem
+
+# NPM dependencies
+node_modules
+package-lock.json
+
+# IDE configurations
+.idea
+.vscode/*
+!.vscode/settings.json
+!.vscode/extensions.json
+!.vscode/tasks.json
+
+# Misc
+_sass/dist
+assets/js/dist
diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..58062c5
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "assets/lib"]
+	path = assets/lib
+	url = https://github.com/cotes2020/chirpy-static-assets.git
diff --git a/.nojekyll b/.nojekyll
new file mode 100644
index 0000000..8b13789
--- /dev/null
+++ b/.nojekyll
@@ -0,0 +1 @@
+
diff --git a/.vscode/extensions.json b/.vscode/extensions.json
new file mode 100644
index 0000000..082bc94
--- /dev/null
+++ b/.vscode/extensions.json
@@ -0,0 +1,3 @@
+{
+  "recommendations": ["ms-vscode-remote.remote-containers"]
+}
diff --git a/.vscode/settings.json b/.vscode/settings.json
new file mode 100644
index 0000000..5e8a04f
--- /dev/null
+++ b/.vscode/settings.json
@@ -0,0 +1,30 @@
+{
+  // Prettier
+  "editor.defaultFormatter": "esbenp.prettier-vscode",
+  "editor.formatOnSave": true,
+  // Shopify Liquid
+  "files.associations": {
+    "*.html": "liquid"
+  },
+  "[markdown]": {
+    "editor.defaultFormatter": "yzhang.markdown-all-in-one"
+  },
+  // Formatter
+  "[html][liquid]": {
+    "editor.defaultFormatter": "Shopify.theme-check-vscode"
+  },
+  "[shellscript]": {
+    "editor.defaultFormatter": "mkhl.shfmt"
+  },
+  // Disable vscode built-in stylelint
+  "css.validate": false,
+  "scss.validate": false,
+  "less.validate": false,
+  // Stylint extension settings
+  "stylelint.snippet": ["css", "scss"],
+  "stylelint.validate": ["css", "scss"],
+  // Run tasks in macOS
+  "terminal.integrated.profiles.osx": {
+    "zsh": { "path": "/bin/zsh", "args": ["-l", "-i"] }
+  }
+}
diff --git a/.vscode/tasks.json b/.vscode/tasks.json
new file mode 100644
index 0000000..7f0fdb8
--- /dev/null
+++ b/.vscode/tasks.json
@@ -0,0 +1,26 @@
+{
+  "version": "2.0.0",
+  "tasks": [
+    {
+      "label": "Run Jekyll Server",
+      "type": "shell",
+      "command": "./tools/run.sh",
+      "group": {
+        "kind": "build",
+        "isDefault": true
+      },
+      "problemMatcher": [],
+      "detail": "Runs the Jekyll server with live reload."
+    },
+    {
+      "label": "Build Jekyll Site",
+      "type": "shell",
+      "command": "./tools/test.sh",
+      "group": {
+        "kind": "build"
+      },
+      "problemMatcher": [],
+      "detail": "Build the Jekyll site for production."
+    }
+  ]
+}
diff --git a/Gemfile b/Gemfile
new file mode 100644
index 0000000..83c04c0
--- /dev/null
+++ b/Gemfile
@@ -0,0 +1,14 @@
+# frozen_string_literal: true
+
+source "https://rubygems.org"
+
+gem "jekyll-theme-chirpy", "~> 7.1"
+
+gem "html-proofer", "~> 5.0", group: :test
+
+platforms :mingw, :x64_mingw, :mswin, :jruby do
+  gem "tzinfo", ">= 1", "< 3"
+  gem "tzinfo-data"
+end
+
+gem "wdm", "~> 0.1.1", :platforms => [:mingw, :x64_mingw, :mswin]
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..a6f6c9f
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2021 Cotes Chung
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..0b32bf4
--- /dev/null
+++ b/README.md
@@ -0,0 +1,60 @@
+# Chirpy Starter
+
+[![Gem Version](https://img.shields.io/gem/v/jekyll-theme-chirpy)][gem]&nbsp;
+[![GitHub license](https://img.shields.io/github/license/cotes2020/chirpy-starter.svg?color=blue)][mit]
+
+When installing the [**Chirpy**][chirpy] theme through [RubyGems.org][gem], Jekyll can only read files in the folders
+`_data`, `_layouts`, `_includes`, `_sass` and `assets`, as well as a small part of options of the `_config.yml` file
+from the theme's gem. If you have ever installed this theme gem, you can use the command
+`bundle info --path jekyll-theme-chirpy` to locate these files.
+
+The Jekyll team claims that this is to leave the ball in the user’s court, but this also results in users not being
+able to enjoy the out-of-the-box experience when using feature-rich themes.
+
+To fully use all the features of **Chirpy**, you need to copy the other critical files from the theme's gem to your
+Jekyll site. The following is a list of targets:
+
+```shell
+.
+├── _config.yml
+├── _plugins
+├── _tabs
+└── index.html
+```
+
+To save you time, and also in case you lose some files while copying, we extract those files/configurations of the
+latest version of the **Chirpy** theme and the [CD][CD] workflow to here, so that you can start writing in minutes.
+
+## Prerequisites
+
+Follow the instructions in the [Jekyll Docs](https://jekyllrb.com/docs/installation/) to complete the installation of
+the basic environment. [Git](https://git-scm.com/) also needs to be installed.
+
+## Installation
+
+Sign in to GitHub and [**use this template**][use-template] to generate a brand new repository and name it
+`USERNAME.github.io`, where `USERNAME` represents your GitHub username.
+
+Then clone it to your local machine and run:
+
+```console
+$ bundle
+```
+
+## Usage
+
+Please see the [theme's docs](https://github.com/cotes2020/jekyll-theme-chirpy#documentation).
+
+## Contributing
+
+This repository is automatically updated with new releases from the theme repository. If you encounter any issues or want to contribute to its improvement, please visit the [theme repository][chirpy] to provide feedback.
+
+## License
+
+This work is published under [MIT][mit] License.
+
+[gem]: https://rubygems.org/gems/jekyll-theme-chirpy
+[chirpy]: https://github.com/cotes2020/jekyll-theme-chirpy/
+[use-template]: https://github.com/cotes2020/chirpy-starter/generate
+[CD]: https://en.wikipedia.org/wiki/Continuous_deployment
+[mit]: https://github.com/cotes2020/chirpy-starter/blob/master/LICENSE
diff --git a/_config.yml b/_config.yml
new file mode 100644
index 0000000..9f75866
--- /dev/null
+++ b/_config.yml
@@ -0,0 +1,225 @@
+# The Site Configuration
+
+# Import the theme
+theme: jekyll-theme-chirpy
+
+# The language of the webpage › http://www.lingoes.net/en/translator/langcode.htm
+# If it has the same name as one of the files in folder `_data/locales`, the layout language will also be changed,
+# otherwise, the layout language will use the default value of 'en'.
+lang: en
+
+# Change to your timezone › https://kevinnovak.github.io/Time-Zone-Picker
+timezone:
+
+# jekyll-seo-tag settings › https://github.com/jekyll/jekyll-seo-tag/blob/master/docs/usage.md
+# ↓ --------------------------
+
+title: Chirpy # the main title
+
+tagline: A text-focused Jekyll theme # it will display as the subtitle
+
+description: >- # used by seo meta and the atom feed
+  A minimal, responsive and feature-rich Jekyll theme for technical writing.
+
+# Fill in the protocol & hostname for your site.
+# E.g. 'https://username.github.io', note that it does not end with a '/'.
+url: ""
+
+github:
+  username: github_username # change to your GitHub username
+
+twitter:
+  username: twitter_username # change to your Twitter username
+
+social:
+  # Change to your full name.
+  # It will be displayed as the default author of the posts and the copyright owner in the Footer
+  name: your_full_name
+  email: example@domain.com # change to your email address
+  links:
+    # The first element serves as the copyright owner's link
+    - https://twitter.com/username # change to your Twitter homepage
+    - https://github.com/username # change to your GitHub homepage
+    # Uncomment below to add more social links
+    # - https://www.facebook.com/username
+    # - https://www.linkedin.com/in/username
+
+# Site Verification Settings
+webmaster_verifications:
+  google: # fill in your Google verification code
+  bing: # fill in your Bing verification code
+  alexa: # fill in your Alexa verification code
+  yandex: # fill in your Yandex verification code
+  baidu: # fill in your Baidu verification code
+  facebook: # fill in your Facebook verification code
+
+# ↑ --------------------------
+# The end of `jekyll-seo-tag` settings
+
+# Web Analytics Settings
+analytics:
+  google:
+    id: # fill in your Google Analytics ID
+  goatcounter:
+    id: # fill in your GoatCounter ID
+  umami:
+    id: # fill in your Umami ID
+    domain: # fill in your Umami domain
+  matomo:
+    id: # fill in your Matomo ID
+    domain: # fill in your Matomo domain
+  cloudflare:
+    id: # fill in your Cloudflare Web Analytics token
+  fathom:
+    id: # fill in your Fathom Site ID
+
+# Page views settings
+pageviews:
+  provider: # now only supports 'goatcounter'
+
+# Prefer color scheme setting.
+#
+# Note: Keep empty will follow the system prefer color by default,
+# and there will be a toggle to switch the theme between dark and light
+# on the bottom left of the sidebar.
+#
+# Available options:
+#
+#     light — Use the light color scheme
+#     dark — Use the dark color scheme
+#
+theme_mode: # [light | dark]
+
+# The CDN endpoint for media resources.
+# Notice that once it is assigned, the CDN url
+# will be added to all media resources (site avatar, posts' images, audio and video files) paths starting with '/'
+#
+# e.g. 'https://cdn.com'
+cdn:
+
+# the avatar on sidebar, support local or CORS resources
+avatar:
+
+# The URL of the site-wide social preview image used in SEO `og:image` meta tag.
+# It can be overridden by a customized `page.image` in front matter.
+social_preview_image: # string, local or CORS resources
+
+# boolean type, the global switch for TOC in posts.
+toc: true
+
+comments:
+  # Global switch for the post-comment system. Keeping it empty means disabled.
+  provider: # [disqus | utterances | giscus]
+  # The provider options are as follows:
+  disqus:
+    shortname: # fill with the Disqus shortname. › https://help.disqus.com/en/articles/1717111-what-s-a-shortname
+  # utterances settings › https://utteranc.es/
+  utterances:
+    repo: # <gh-username>/<repo>
+    issue_term: # < url | pathname | title | ...>
+  # Giscus options › https://giscus.app
+  giscus:
+    repo: # <gh-username>/<repo>
+    repo_id:
+    category:
+    category_id:
+    mapping: # optional, default to 'pathname'
+    strict: # optional, default to '0'
+    input_position: # optional, default to 'bottom'
+    lang: # optional, default to the value of `site.lang`
+    reactions_enabled: # optional, default to the value of `1`
+
+# Self-hosted static assets, optional › https://github.com/cotes2020/chirpy-static-assets
+assets:
+  self_host:
+    enabled: # boolean, keep empty means false
+    # specify the Jekyll environment, empty means both
+    # only works if `assets.self_host.enabled` is 'true'
+    env: # [development | production]
+
+pwa:
+  enabled: true # The option for PWA feature (installable)
+  cache:
+    enabled: true # The option for PWA offline cache
+    # Paths defined here will be excluded from the PWA cache.
+    # Usually its value is the `baseurl` of another website that
+    # shares the same domain name as the current website.
+    deny_paths:
+      # - "/example"  # URLs match `<SITE_URL>/example/*` will not be cached by the PWA
+
+paginate: 10
+
+# The base URL of your site
+baseurl: ""
+
+# ------------ The following options are not recommended to be modified ------------------
+
+kramdown:
+  footnote_backlink: "&#8617;&#xfe0e;"
+  syntax_highlighter: rouge
+  syntax_highlighter_opts: # Rouge Options › https://github.com/jneen/rouge#full-options
+    css_class: highlight
+    # default_lang: console
+    span:
+      line_numbers: false
+    block:
+      line_numbers: true
+      start_line: 1
+
+collections:
+  tabs:
+    output: true
+    sort_by: order
+
+defaults:
+  - scope:
+      path: "" # An empty string here means all files in the project
+      type: posts
+    values:
+      layout: post
+      comments: true # Enable comments in posts.
+      toc: true # Display TOC column in posts.
+      # DO NOT modify the following parameter unless you are confident enough
+      # to update the code of all other post links in this project.
+      permalink: /posts/:title/
+  - scope:
+      path: _drafts
+    values:
+      comments: false
+  - scope:
+      path: ""
+      type: tabs # see `site.collections`
+    values:
+      layout: page
+      permalink: /:title/
+
+sass:
+  style: compressed
+
+compress_html:
+  clippings: all
+  comments: all
+  endings: all
+  profile: false
+  blanklines: false
+  ignore:
+    envs: [development]
+
+exclude:
+  - "*.gem"
+  - "*.gemspec"
+  - docs
+  - tools
+  - README.md
+  - LICENSE
+  - "*.config.js"
+  - package*.json
+
+jekyll-archives:
+  enabled: [categories, tags]
+  layouts:
+    category: category
+    tag: tag
+  permalinks:
+    tag: /tags/:name/
+    category: /categories/:name/
diff --git a/_data/contact.yml b/_data/contact.yml
new file mode 100644
index 0000000..ed40acb
--- /dev/null
+++ b/_data/contact.yml
@@ -0,0 +1,40 @@
+#  The contact options.
+
+- type: github
+  icon: "fab fa-github"
+
+- type: twitter
+  icon: "fa-brands fa-x-twitter"
+
+- type: email
+  icon: "fas fa-envelope"
+  noblank: true # open link in current tab
+
+- type: rss
+  icon: "fas fa-rss"
+  noblank: true
+# Uncomment and complete the url below to enable more contact options
+#
+# - type: mastodon
+#   icon: 'fab fa-mastodon'   # icons powered by <https://fontawesome.com/>
+#   url:  ''                  # Fill with your Mastodon account page, rel="me" will be applied for verification
+#
+# - type: linkedin
+#   icon: 'fab fa-linkedin'   # icons powered by <https://fontawesome.com/>
+#   url:  ''                  # Fill with your Linkedin homepage
+#
+# - type: stack-overflow
+#   icon: 'fab fa-stack-overflow'
+#   url:  ''                  # Fill with your stackoverflow homepage
+#
+# - type: bluesky
+#   icon: 'fa-brands fa-bluesky'
+#   url: ''                   # Fill with your Bluesky profile link
+#
+# - type: reddit
+#   icon: 'fa-brands fa-reddit'
+#   url: ''                   # Fill with your Reddit profile link
+#
+# - type: threads
+#   icon: 'fa-brands fa-threads'
+#   url: ''                   # Fill with your Threads profile link
diff --git a/_data/share.yml b/_data/share.yml
new file mode 100644
index 0000000..6f97568
--- /dev/null
+++ b/_data/share.yml
@@ -0,0 +1,50 @@
+#  Sharing options at the bottom of the post.
+#  Icons from <https://fontawesome.com/>
+
+platforms:
+  - type: Twitter
+    icon: "fa-brands fa-square-x-twitter"
+    link: "https://twitter.com/intent/tweet?text=TITLE&url=URL"
+
+  - type: Facebook
+    icon: "fab fa-facebook-square"
+    link: "https://www.facebook.com/sharer/sharer.php?title=TITLE&u=URL"
+
+  - type: Telegram
+    icon: "fab fa-telegram"
+    link: "https://t.me/share/url?url=URL&text=TITLE"
+
+  # Uncomment below if you need to.
+  #
+  # - type: Linkedin
+  #   icon: "fab fa-linkedin"
+  #   link: "https://www.linkedin.com/sharing/share-offsite/?url=URL"
+  #
+  # - type: Weibo
+  #   icon: "fab fa-weibo"
+  #   link: "https://service.weibo.com/share/share.php?title=TITLE&url=URL"
+  #
+  # - type: Mastodon
+  #   icon: "fa-brands fa-mastodon"
+  #   # See: https://github.com/justinribeiro/share-to-mastodon#properties
+  #   instances:
+  #     - label: mastodon.social
+  #       link: "https://mastodon.social/"
+  #     - label: mastodon.online
+  #       link: "https://mastodon.online/"
+  #     - label: fosstodon.org
+  #       link: "https://fosstodon.org/"
+  #     - label: photog.social
+  #       link: "https://photog.social/"
+  #
+  # - type: Bluesky
+  #   icon: "fa-brands fa-bluesky"
+  #   link: "https://bsky.app/intent/compose?text=TITLE%20URL"
+  #
+  # - type: Reddit
+  #   icon: "fa-brands fa-square-reddit"
+  #   link: "https://www.reddit.com/submit?url=URL&title=TITLE"
+  #
+  # - type: Threads
+  #   icon: "fa-brands fa-square-threads"
+  #   link: "https://www.threads.net/intent/post?text=TITLE%20URL"
diff --git a/_plugins/posts-lastmod-hook.rb b/_plugins/posts-lastmod-hook.rb
new file mode 100644
index 0000000..1fd6ecf
--- /dev/null
+++ b/_plugins/posts-lastmod-hook.rb
@@ -0,0 +1,14 @@
+#!/usr/bin/env ruby
+#
+# Check for changed posts
+
+Jekyll::Hooks.register :posts, :post_init do |post|
+
+  commit_num = `git rev-list --count HEAD "#{ post.path }"`
+
+  if commit_num.to_i > 1
+    lastmod_date = `git log -1 --pretty="%ad" --date=iso "#{ post.path }"`
+    post.data['last_modified_at'] = lastmod_date
+  end
+
+end
diff --git a/_posts/.placeholder b/_posts/.placeholder
new file mode 100644
index 0000000..8b13789
--- /dev/null
+++ b/_posts/.placeholder
@@ -0,0 +1 @@
+
diff --git a/_tabs/about.md b/_tabs/about.md
new file mode 100644
index 0000000..ddb2bc4
--- /dev/null
+++ b/_tabs/about.md
@@ -0,0 +1,8 @@
+---
+# the default layout is 'page'
+icon: fas fa-info-circle
+order: 4
+---
+
+> Add Markdown syntax content to file `_tabs/about.md`{: .filepath } and it will show up on this page.
+{: .prompt-tip }
diff --git a/_tabs/archives.md b/_tabs/archives.md
new file mode 100644
index 0000000..c3abc59
--- /dev/null
+++ b/_tabs/archives.md
@@ -0,0 +1,5 @@
+---
+layout: archives
+icon: fas fa-archive
+order: 3
+---
diff --git a/_tabs/categories.md b/_tabs/categories.md
new file mode 100644
index 0000000..2d241be
--- /dev/null
+++ b/_tabs/categories.md
@@ -0,0 +1,5 @@
+---
+layout: categories
+icon: fas fa-stream
+order: 1
+---
diff --git a/_tabs/tags.md b/_tabs/tags.md
new file mode 100644
index 0000000..ded3adc
--- /dev/null
+++ b/_tabs/tags.md
@@ -0,0 +1,5 @@
+---
+layout: tags
+icon: fas fa-tags
+order: 2
+---
diff --git a/assets/lib b/assets/lib
new file mode 160000
index 0000000..a231bc7
--- /dev/null
+++ b/assets/lib
@@ -0,0 +1 @@
+Subproject commit a231bc7e2c67198e604950cb2be9147a0b2020c0
diff --git a/index.html b/index.html
new file mode 100644
index 0000000..1357b08
--- /dev/null
+++ b/index.html
@@ -0,0 +1,4 @@
+---
+layout: home
+# Index page
+---
diff --git a/tools/run.sh b/tools/run.sh
new file mode 100755
index 0000000..0efc452
--- /dev/null
+++ b/tools/run.sh
@@ -0,0 +1,54 @@
+#!/usr/bin/env bash
+#
+# Run jekyll serve and then launch the site
+
+prod=false
+command="bundle exec jekyll s -l"
+host="127.0.0.1"
+
+help() {
+  echo "Usage:"
+  echo
+  echo "   bash /path/to/run [options]"
+  echo
+  echo "Options:"
+  echo "     -H, --host [HOST]    Host to bind to."
+  echo "     -p, --production     Run Jekyll in 'production' mode."
+  echo "     -h, --help           Print this help information."
+}
+
+while (($#)); do
+  opt="$1"
+  case $opt in
+  -H | --host)
+    host="$2"
+    shift 2
+    ;;
+  -p | --production)
+    prod=true
+    shift
+    ;;
+  -h | --help)
+    help
+    exit 0
+    ;;
+  *)
+    echo -e "> Unknown option: '$opt'\n"
+    help
+    exit 1
+    ;;
+  esac
+done
+
+command="$command -H $host"
+
+if $prod; then
+  command="JEKYLL_ENV=production $command"
+fi
+
+if [ -e /proc/1/cgroup ] && grep -q docker /proc/1/cgroup; then
+  command="$command --force_polling"
+fi
+
+echo -e "\n> $command\n"
+eval "$command"
diff --git a/tools/test.sh b/tools/test.sh
new file mode 100755
index 0000000..331de1c
--- /dev/null
+++ b/tools/test.sh
@@ -0,0 +1,89 @@
+#!/usr/bin/env bash
+#
+# Build and test the site content
+#
+# Requirement: html-proofer, jekyll
+#
+# Usage: See help information
+
+set -eu
+
+SITE_DIR="_site"
+
+_config="_config.yml"
+
+_baseurl=""
+
+help() {
+  echo "Build and test the site content"
+  echo
+  echo "Usage:"
+  echo
+  echo "   bash $0 [options]"
+  echo
+  echo "Options:"
+  echo '     -c, --config   "<config_a[,config_b[...]]>"    Specify config file(s)'
+  echo "     -h, --help               Print this information."
+}
+
+read_baseurl() {
+  if [[ $_config == *","* ]]; then
+    # multiple config
+    IFS=","
+    read -ra config_array <<<"$_config"
+
+    # reverse loop the config files
+    for ((i = ${#config_array[@]} - 1; i >= 0; i--)); do
+      _tmp_baseurl="$(grep '^baseurl:' "${config_array[i]}" | sed "s/.*: *//;s/['\"]//g;s/#.*//")"
+
+      if [[ -n $_tmp_baseurl ]]; then
+        _baseurl="$_tmp_baseurl"
+        break
+      fi
+    done
+
+  else
+    # single config
+    _baseurl="$(grep '^baseurl:' "$_config" | sed "s/.*: *//;s/['\"]//g;s/#.*//")"
+  fi
+}
+
+main() {
+  # clean up
+  if [[ -d $SITE_DIR ]]; then
+    rm -rf "$SITE_DIR"
+  fi
+
+  read_baseurl
+
+  # build
+  JEKYLL_ENV=production bundle exec jekyll b \
+    -d "$SITE_DIR$_baseurl" -c "$_config"
+
+  # test
+  bundle exec htmlproofer "$SITE_DIR" \
+    --disable-external \
+    --ignore-urls "/^http:\/\/127.0.0.1/,/^http:\/\/0.0.0.0/,/^http:\/\/localhost/"
+}
+
+while (($#)); do
+  opt="$1"
+  case $opt in
+  -c | --config)
+    _config="$2"
+    shift
+    shift
+    ;;
+  -h | --help)
+    help
+    exit 0
+    ;;
+  *)
+    # unknown option
+    help
+    exit 1
+    ;;
+  esac
+done
+
+main