Moving to Jekyll

Gives us a lot more flexibility. In particular:

- Markdown or HTML (for all content)
  - This means non-coders can easily add content if they know how to push/pull to Github
- Templates!
- SCSS. And Coffeescript, if we ever need JS. 
- Overall, a more sustainable structure for maintainance.
  - Though this might eventually have moved to a Rails app, unless we need user authentication to protect our content, we won't have to make that move. 

The slides can be found in `/slides`, with the markdown files going in `/slides/markdown`. The exercises live in `/exercises`. The rest is straightforward, after reading Jekyll's getting started guide, which takes 4 minutes.