Revert "[fix bug 927575] Update CTA for Serbia Fx OS page"

This reverts commit 744bce7b437f06f1618221cc9588d6d3fc347a54.
Bug 897082 - Contact/Spaces/Communities migration

Migrating this content to bedrock and consolidating it in one place.
Bug 931310: Further improve New Relic deploy ping.

* Move revision.txt handling to update instead of pre_update.
* Get a real change log instead of just a github url.
* Steal wonderful description code from chief-james (willkg)
Merge pull request #1449 from pmclanahan/improve-newrelic-deploy-ping-931310

Bug 931310: Further improve New Relic deploy ping.
Merge pull request #1444 from mozilla/bug-897082-contact-and-spaces

Bug 897082 contact and spaces