Deploy an instance of hedgedoc

We currently are using the hackmd.io services quite a lot, it would be nice to have our own instance of such a service. Using Hedgedoc [1] [2] seems a reasonable choice, as it allows to use an API (which the original hackmd application does not offer), especially for usages like automating the preparation of the weekly planning pad.

• [1] https://github.com/hedgedoc/hedgedoc
• [2] https://docs.hedgedoc.org/

I think it should be:

• available from the internet

• only accept pad creation from authenticated users

• ideally, integrated with some auth provider or SSO (keycloak based probably [3])

• [3] https://docs.hedgedoc.org/guides/auth/saml-keycloak/

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Migrated from T2827 (view on Phabricator)