Adding API docs.
Updating some wording.
Using the larger Flask doc theme.

This lets us have nice multi-page docs.
Adding a doc image.
Fixing weird header.
Updating the index.
Fixing wording, adding in links.
Adding a quickstart (in progress).
Adding a note about password strength policies.
Adding a section customizing registration fields.
Adding a section on customizing the login page.
Adding bit about customizing routes.
Adding docs on customizing templates.
Fixing wording.
Adding a disable views section.

Also removing a lot of old stuff.
Removing 'future features' section.
Removing 'how do i...?' section.
Fixing our TOC.
Adding a help page to the docs.