This website is built using org-mode, which is an Emacs markdown format pretty similar to normal
markdown. Since this website is built using org-mode, the publishing system is also written in
Emacs Lisp. The build.el file specifies how the system should be built. It's very simple, it
just specifies the output directory for the HTML files and any additional assets (images, css, etc).
To build this website locally, you will need to use Emacs and org-mode, neither of which I think it's fair asking you to learn, and so if you write the files in Markdown, I can convert them to org-mode using Pandoc to save you the trouble.
Files are named according to the format <language>-subject.org. The language just specifies which
language in the course this file is related to, and the subject is just a couple work description
of what's covered in that webpage.