Once restarted onto the parent change, our Gerrit deployment will no
longer link to Gitiles representations of changes or the Git tree.
Explicitly deny access to the Gitiles URL base path in the Apache
vhost config, since we can't effectively remove the plugin itself.
This should help prevent search engines from finding its copies of
our projects rather than the ones we want people to use in Gitea.
Change-Id: I3c96221256662443f7a43344afd12194dce82b9d