doc/integration.mediawiki.org to wikimedia.org

gallium serves HTTP and HTTPS on its public IP for the following
domains:

 integration.mediawiki.org
 doc.mediawiki.org

 integration.wikimedia.org
 doc.wikimedia.org

This patch moves the mediawiki.org entries to the production cluster and
let Apache handle redirects to the misc varnish which would host the
wikimedia.org entries.

Varnish conf: https://gerrit.wikimedia.org/r/#/c/105939/

RT #6593
RT #6594

Change-Id: I4d00cce7d27657c06023bc5f3b222908d9399e9c