1. Sync sphinx dependency with global requirements. It caps python 2 since
sphinx 2.0 no longer supports Python 2.7.
2. Update some URLs to latest
3. Remove unncessary "=="

Change-Id: Idcb616fd3add4d58f22b91865cec8a54fe492092

Kayobe is to become an OpenStack-related project, and as such will use
Gerrit for code reviews and Storyboard for issue and feature tracking.
The README and CONTRIBUTING documents have been updated to reflect that,
and a standard OpenStack HACKING document has been added.

Change-Id: Id03bcb5183bfbf6e84bb4d9c22f85d9418b6b4fc
Story: #2001637
Task: #6644