migrate to Jekyll

.github/workflows/build.yml

@@ -0,0 +1,16 @@
+name: Test Middleman build
+on:
+  push:
+    branches: [master]
+  pull_request:
+    branches: [master]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - uses: ruby/setup-ruby@v1
+      with:
+        bundler-cache: true
+    - run: bundle exec jekyll build

.gitignore

@@ -1,32 +1,5 @@
-# See https://help.github.com/ignore-files/ for more about ignoring files.
-#
-# If you find yourself ignoring temporary files generated by your text editor
-# or operating system, you probably want to add a global ignore instead:
-# git config --global core.excludesfile ~/.gitignore_global
-
-# Ignore bundler config
-/.bundle
-
-# Ignore the build directory
-/build
-
-# Ignore bower packages
-/vendor/assets/bower
-
-# Ignore RVM/RBEnv config files
-/.rvmrc
-/.ruby-version
-/.ruby-gemset
-
-# Ignore cache
-/.sass-cache
-/.cache
-
-# Ignore .DS_store file
-.DS_Store
-
-# Ignore DotEnv file
-/.env
-
-# IntellijIDEA
-.idea/
+_site
+.sass-cache
+.jekyll-cache
+.jekyll-metadata
+vendor

.ruby-version

@@ -0,0 +1 @@
+3.3.5

404.html

@@ -0,0 +1,25 @@
+---
+permalink: /404.html
+layout: default
+---
+
+<style type="text/css" media="screen">
+  .container {
+    margin: 10px auto;
+    max-width: 600px;
+    text-align: center;
+  }
+  h1 {
+    margin: 30px 0;
+    font-size: 4em;
+    line-height: 1;
+    letter-spacing: -1px;
+  }
+</style>
+
+<div class="container">
+  <h1>404</h1>
+
+  <p><strong>Page not found :(</strong></p>
+  <p>The requested page could not be found.</p>
+</div>

Gemfile

@@ -1,12 +1,16 @@
-source 'https://rubygems.org'
+# frozen_string_literal: true
 
-gem 'middleman', '~> 4.4'
-gem 'middleman-minify-html'
-gem 'middleman-favicon-maker'
-gem 'middleman-gh-pages'
-gem 'middleman-livereload'
+source "https://rubygems.org"
 
-gem 'tzinfo-data', platforms: [:mswin, :mingw, :jruby]
-gem 'wdm', '~> 0.1', platforms: [:mswin, :mingw]
+ruby file: '.ruby-version'
 
-gem 'dotenv'
+gem "jekyll", "~> 4.3.4"
+
+group :jekyll_plugins do
+  gem "jekyll-feed", "~> 0.12"
+end
+
+platforms :mingw, :x64_mingw, :mswin, :jruby do
+  gem "tzinfo", ">= 1", "< 3"
+  gem "tzinfo-data"
+end