Enable StrictTransportSecurity for wikitech

Enable STS on Wikitech, just like we recently did on Bugzilla.

Bug: 38516
Change-Id: If8d97284cafb72c062e74221540e5a101c7c04ba
retab wikitech.wikimedia.org.erb

Change-Id: If06efe55e88f31496f1c63c57e416d87363aef5f
Merge changes If06efe55,If8d97284 into production

* changes:
  retab wikitech.wikimedia.org.erb
  Enable StrictTransportSecurity for wikitech