feat: Use grouper admin to resolve usability issues

[fsbraun]

Fixes

• 83

• 97

• Adds Django 4.2 support

Requires https://github.com/django-cms/django-cms/pull/7513 and https://github.com/django-cms/djangocms-versioning/pull/326 to be merged.

• https://github.com/django-cms/django-cms/pull/7513
• https://github.com/django-cms/djangocms-versioning/pull/326