You can preview the book and access the Table of Contents
This textbook is mainly written in kramdown (a superset of Markdown) format. A small JavaScript and CSS class takes care of the rendering of the book. The book is stored directly into GitHub and is instantly regenerated through the GitHub pages through the action of Jekyll.
Clone this repository. Install Ruby. Within the folder physics-book, run
gem install bundler jekyll
bundle exec jekyll serve --incremental
Now browse to http://localhost:4000