This is a web page source files. All of the files should be proper markdown files accepted by Jekyll static site generator.
In order to build the site, you'll need Jekyll framework installed and jekyll-rst plugin. Easiest way to achieve it, is to install it from system repositories.
If your distribution doesn't contain it (even in external ones, like PPA for Ubuntu, AUR for Arch or some portage overlay from Gentoo), that it might be installed locally using Bundler, which typical usage would be as follows:
$ cd window-maker.github.io && bundler init
$ bundler add jekyll
$ mkdir _plugins
$ git clone https://github.com/gryf/jekyll-rst _plugins/jekyll-rst
$ pip install docutils pygments
$ gem install RbST nokogiri
$ bundler exec jekyll serve
Consult jekyll-rst plugin documentation for requirements. Other options for installing dependencies are also possible - they might be installed from distribution repositories.
Last line will initialize gemfile, add jekyll to it, and then perform jekyll serve which underneath will build the site and than run simple http server on
http://localhost:4000 in development mode. More about jekyll you can find on
it's page