This is a template course web site built using Bootstrap, so it's responsive for multiple device sizes. To customize it for a class, change the _config.yml file (don't like orange? switch it there) and update each of the files in the sections folder with information specific to your class. You can also add custom CSS to the _sass/custom-scss.scss file.
Each semester's material can be added as a new page into the _semesters folder. I've got it set up to generate each session's information for that semester from the YML frontmatter in the markdown page. No other content is needed. There's a sample of what I have set up in the 2015_3_Fall.md file, and you can see how that is used to generate the page by looking at the _layouts/semester.html file.
Want to use this material yourself? These documents are licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
Basically, say you picked it up from me, and do what you like with it.