Pages training materials

This pull request is the pull request formally known as #111 before I went ahead and :boom:  the internet. It was based on initial discussion and feedback in #70, with significant awesomification (:tm:) by @matthewmccullough.

Punch list:

- [ ] Certain slides falling off small screens (@jordanmccullough, halp?)
- [ ] @matthewmccullough's has unmerged edits on the last ~10 slides (I think?)
- [ ] Screencastin' && v/o'n