Updated all djangoproject.com links to reference the stable version

[tim-schilling]

Description

Updated all djangoproject.com links to reference the stable version

Motivation and Context

We should reference stable versions of the documentation and not unsupported versions.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have run the pre-commit run command to format and lint.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• I have added my name and/or github handle to AUTHORS.rst
• I have added my change to CHANGES.rst
• All new and existing tests passed.

[ddabble]

Nice, I agree that we should reference the stable version of the Django docs 👍

Added a couple polishing changes in fc82764 :)