Broken links to recordings

One of our recent architecture changes, namely separating the BBB servers (e.g. bbb.de.meet.coop) from the Greenlight servers (e.g. gl.de.meet.coop, de.meet.coop, etc.) had the side effect of breaking external links to recordings.

For example:

We should add a rewrite to the nginx configuration of the GL clients at our “white brand” instances, de.meet.coop and ca.meet.coop.