[web] Comments from discourse via embed

Lars Bilkerequested to merge
bilke/ogs:discourse-embed into master

Most of the configuration happens on the discourse side: https://meta.discourse.org/t/embed-discourse-comments-on-another-website-via-javascript/31963.

  1. Tests covering your feature were added?
  2. Any new feature or behaviour change was documented?
Edited by Lars Bilke

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