remove contint web material

We used puppet to maintain the continuous integration webportal at
http://integration.mediawiki.org/, that in turn require us to ask ops to
merge the changes for which you guys have no real added value.

I have migrated all those files to the integration/docroot.git
repository with  https://gerrit.wikimedia.org/r/53743  That will let us
deploy updates of the website without vasting ops precious time.

Change-Id: Ie6a53bd73a5d8d72278191d94f299cb13230661e