WIP: Remove tags from news (1)

[frankystone]

This has to be done before we update to django 4.2, because the references to the tagging app (which might get removed at all) are needed. Although this could be made simpler, imho, i decided to go the official django way and squash all migrations for the news. The advantage of this workflow is to have in the end only one migration file (instead of 4). This must be a two-step process with two separate PR's:

1. PR (this one): Removes the tags field from the model in news
2. PR (after the first PR got merged): Will remove old migrations files and the references to obsolete migrations in 0001_squashed_0004_remove_post_tags.py (that is: removing the line starting with replaces)
   To get this in:

Merge this branch
run ./manage.py migrate

[SirVer]

Looks good to me. Thanks for working on this!