[VOL-2875] Documentation update

- Updated the main landing page and overview documentation
- Added the lab setup (copied from CORD docs)
- Use forked sphinx-multiversion to publish docs, which allows versions
  to be listed at bottom of sidebar
- Updated logo and favicon, fixed CSS to make logo legible
- Use VERSION file to set the version in the sidebar
- Add more words to dictionary
- removed reload functionality that is nonworking in Sphinx 2.x
- Fixed lint/linkcheck issues

Change-Id: I032e67d76393778fc697944a6d5df9c8cdacbbc4
diff --git a/git_refs b/git_refs
index b315a0e..799887c 100644
--- a/git_refs
+++ b/git_refs
@@ -11,12 +11,14 @@
 
 _REPO NAME_             _DIR_    _REF_
 
-pyvoltha                /        master
 bbsim                   /        master
 cord-tester             /        master
+ofagent-go              /        master
+openolt                 /        master
+pyvoltha                /        master
+voltctl                 /        master
 voltha-go               /        master
 voltha-openolt-adapter  /        master
 voltha-openonu-adapter  /        master
 voltha-protos           /        master
 voltha-system-tests     /        master
-voltctl                 /        master