Hedgedoc for collaboration

[metazool]

Original discussion and input from the Devops folks is in this earlier thread. This resulted in agreement to us setting up a Hedgedoc instance as long as someone in the RSE group offers to maintain it while we trial it, which I'm happy to undertake (and try to do in a way that makes for ease of handover if we want longer term support for it)

The CodeRefinery workshops are making really nice use of Hedgedoc (a FOSS alternative to Google Docs, Etherpad etc) to run shared Q&A during their workshop sessions. We also saw this model (though not with Hedgedoc) used to great effect during some of the RSECon workshops.

There's a lot of potential in it both for ease-of-access evolving Q&A documents on technical topics, and a shared notespace during workshops and forums.