1. Update URLs according to document migration
2. Update the dead and outdated links
3. Optimize (e.g. http -> https)
Change-Id: Iad743ad223b8c40ae914beccd936f71a81622d76
Replace URLs for workflow documentation to appropriate parts of the
OpenStack Project Infrastructure Manual.
Change-Id: Id72a42c640b02df3991bafc369ffc38aad1135d4