mailu/docs/contributors
Dimitri Huisman 120cd34989
Switch the container registry used for deploying images from docker
to ghcr.io (github). Images are now first build with '-build'
appended to the tag. E.g. ghcr.io/mailu/admin:master-build.
This is to prevent the image being available before automatic testing has completed.
In the deploy job, the final image is pushed (this still works the same).

Update setup & documentation for switch to ghcr.io
..
database.rst Update docs with the new flask command
environment.rst Switch the container registry used for deploying images from docker
guidelines.rst Remove Swarm everywhere.
localization.rst Remove weblate option from documentation since it is not available anymore.
memo.rst Correct typo
workflow.rst Fix a bunch of typos