Do some documentation cleanup

Adjust some of the documenation to better reflect reality.

- Reflect how prepare stage builds a source RPM repo and the
  building stage builds a binary RPM repo.
- Restructure to better show the architecture page in the initial
  table of contents instead of hidden under the developer section.
- Adjust line length to be in the < 80 restriction just for ease
  of reading and editing...
- Adjust some of the links...

Change-Id: Idb0ca60e20ea65d743e601c38bd89c0b9392a231
Merge "Do some documentation cleanup"