Clean up and reorganize the RBTools documentation.
Review Request #6794 — Created Jan. 16, 2015 and submitted — Latest diff uploaded
This updates the documentation to provide a simpler, more descriptive front page, and to better organize some of the configuration and API pages. The front page starts off with a more fleshed-out description of RBTools, with simple sections on installation and configuration. Each of these point to the relevant pages for the topic. The Installation section no longer has instructions for each OS, but rather links to the new RBTools Downloads page, which has more modern instructions and installers. There's now two configuration pages: One for repository configuration, and one for user configuration. The latter includes configuration of aliases, which is no longer its own page. All the directories now have their own indexes, which are properly chained into toctrees, helping with the organization. Some of the text in various sections was also cleaned up just a bit to flesh out the content and make things more readable.
Built the docs and browsed around. Checked that links were still working
after the intersphinx updates.The docs building didn't show any warnings.