Merge branch 'stable-3.0' into stable-3.1

* stable-3.0:
  Documentation: Refactor footer to match with other plugins
  Documentation: Refactor to match other plugin documentation
  Documentation: Add missing alternative for plugin in-tree testing
  Upgrade bazlets to latest stable-2.16

Change-Id: I85e1757202886a85a310f862e5bf0550d7ffd1bf