All this commit does is move the contents from the README.rst file
into the various subfiles within the tox documentation source folder
so that things render cleanly and with a proper table of contents.
I've resisted the urge to start copy editing, adjusting content,
fixing spacing, titles, etc. All changes should be a simple copy/pasta
from the README to the various subfiles.
I did add some minor content to the README.rst so that it wasn't
just a blank file for those who land there via GitHub or a git
clone.
Change-Id: I892e4e328a2715ddcbafedd97d1328d1f709f312
af1ee36acc