Ahodges/doc/doc 792

Initial, proof of concept draft, focusing initially on enrollment chapters. @shnayder , @clintonb , @dsjen , @mulby , @brianhw , @rocha , @JAAkana , @WatsonEmily , @stroilova please feel free to comment anytime on this PR from now through release.

An HTML draft is now available! http://draft-edx-insights.readthedocs.org/en/latest/

As discussed this isn't actually the case right now.

I can double check the exact schedules, but they are very easy to changes, so I would prefer that @shnayder lets us know when he *wants* them to run, and we can both update the docs and the schedule to ensure they run at that time.