text: Title: [DOC] Install django-cms by hand instruction is incomplete
  Body: ## Description
  
  If you follow the instructions - this will lead to the installation of a broken version of django-cms, because 
  
  `pip install django-cms`
  
  will install django 4 as a dependency, which we don't support
  
  
  * [x] Yes, I want to help fix this issue and I will join #workgroup-documentation on [Slack](https://www.django-cms.org/slack) to confirm with the team that a PR is welcome. 
  * [ ] No, I only want to report the issue.
  