There is a new Etherpad 2.3.0 release. We update our Dockerfile to build
that release and in the process attempt to resynchronize with the
upstream Dockerfile. The config files don't seem to change in any
meanginful way.
The changelog can be found here:
https://github.com/ether/etherpad-lite/blob/v2.3.0/CHANGELOG.md
While we are at it we add screenshots of the main landing page and an
etherpad. This should make it easier to quickly check things when making
changes.
Change-Id: Ibfdab811b51626729f8107146b34794db0e9e2ae
4655ea97ae