This adds a new section to the docs called, "Introduction." I thought
this section would be useful to help repository owners in the transition
from Trebuchet to Scap3.
So far:
- I added the intro section
- I've bumped the docs version
- I documented all added configuration variables (thanks org-mode)
Change-Id: I62955009160adced9d55fc129a3da231ead6f3f4