To run the website locally you will need to do some initial setup:
https://help.github.com/articles/setting-up-your-github-pages-site-locally-with-jekyll
Then to actually run the local webserver with the website, type:
./.sever
which is a script with this contents:
bundle exec jekyll serve --port 2222 --host 127.0.0.1
Gemfile -- Contains setup files needed for first getting the website running locally. README.md -- This file. _config.yml -- Site-level configuration variables for the website. _data/ -- Data variables for website shared across pages. This currently holds a list of the pages in the tutorial and the order in which they should be displayed. _includes/ -- HTML snippets used to construct webpage for markdown pages. _layouts/ -- Starting templates for markdown pages. _site/ -- Not stored in repository, but will be visible if you run the website locally. It contains the output of the template expansions for the website. mei-basic/ -- This directory contains all of the Markdown files for the documentation. resources/ -- This directory contains the javascript (particularly external code) and css files for the website. samples/ -- This directory contains the MEI data for the examples on the pages in /mei-basic/ markdown files.