Also, tests pass now, locally

- edit bin/update-project-dependencies
- fix the values of :
  - sha256sum cabal.project
  - sha256sum cabal.project.freeze
- nix-shell $ ./bin/update-project-dependencies
- git add -u
- git commit

Also, fix for notifications throttle delay value

Also, throttle messages to avoid flooding the client

This commit maps the "Publish" action inside CodiMD/HedgeDoc to the
share URL feature.