Provide a support forum for DACCS

[mishaschwartz]

Once DACCS is being used by the wider community we should have a single place to keep track of user questions, support requests, etc.

Some options:

• slack
• discord
• github

[mishaschwartz]

other option: https://forums.foundationdb.org/

[dchandan]

Another option: Discourse, example usage in the case of Pangeo: https://discourse.pangeo.io

[mishaschwartz]

Implemented at discourse.marbleclimate.com but we're still adding additional comments/features