cache::misc: Set up a temporary etherpad host
Set up a temporary etherpad host to allow interested users to self-serve
restoring pads that were not restored previously while bringing the
service into a working state again after the recent database corruption.
We go for this approach only because it's Wikimania 2016 time and a lot
of interesting pads might have be lost irrevocably before their
users/owners had any chance to follow the best practice of archiving