Documentation Documentation Documentation

Here's a first pass at writing some meta-documentation for the documentation system. Documentation.

I'll hold off on merging this until the type stuff actually, you know, works, and open it up for feedback in the meantime. Let me know if there's anything you're unsure about that this doesn't clear up.
Is Juno mentioned anywhere else in the manual? I don't mind including it, but we may want to include more info about it and other relevant commands perhaps.