Feedback from 0.4.0

[sveetch]

Here is a list of issues and features remaining from 0.4.0 and should be in 0.4.1:

• Add link to sample repository: https://github.com/sveetch/bireli-sample
• Add a notice in project/settings/base.py to help newcomers to find the real settings like "You are probably searching for settings that are instead enabled from 'pyproject.toml:collection' and composed from modules in 'composition_repository/'. See the Bireli documentation for details.";
• Add useful 'django-import-export' in composition repository since it can be a very useful tool;
• Just released 'djangocms-snippet' 5.0.0 is ready for DjangoCMS v4, let's enable it again;
• "name" in package.json use the bare project name which could include whitespaces or special characters that can provoke errors in some libs. This "name" should now use the slugified project name;
• We can upgrade also to Python 3.11;
• Stylelint report is failing since upgrade to 14.0.0 which broken many things;
• Port Dartsass mixin library to PyCssStyleguide new release (with Bootstrap
  manifest?);
• We could implement a basic two level (non recursive) menu with Bootstrap
  dropdown alike here https://github.com/django-cms/django-cms-quickstart/blob/main/backend/templates/menu/menu.html;