Brand oVirt Gerrit

It is not branded - we need to brand it so it feels more like what it is - oVirt's development home.

We need to find ways to make people proud to belong to a project big enough to have its own code hosting, instead of constantly looking to GitHub. (Maybe this should be an epic)

Look at OpenStack's Gerrit for example: https://review.openstack.org/#/q/status:open