This change fixes up a bunch of issues I found with the documentation

build and content:

We were completely missing a documentation page for rbt info.
The API index was referencing common-use-cases instead of

tutorial. When I was redoing all the API docs I had considered

  renaming this file, but for continuity of URLs I decided against that.

  However, the change in the filename snuck into the index.
Remove _static from the build configuration's html_static_path,

  since we don't actually have any static media for the manual, and it

  was triggering a warning.
Fix the git branch computation in the docs config.
Add __autodoc__excludes__ to the forwarding imports in

rbtools/testing/__init__.py to suppress a warning about duplicate

  paths.
Remove an empty copy of the resource-specific.rst file, which

  somehow resurrected despite being deleted in a prior change.
Changed the workflow TOC to list things more in popularity-order than

  (previously incorrect) title order.
Removed some stuff that was left over from a bad merge in

rbt/configuration/repositories.rbt.
Fixed a couple places in the rbt land docs that were listing rbt
  close.
Fix up a few typos and copy-pasteos.

Built the documentation and checked the output.