Update package meta data for well-known labels

[tim-schilling]

There are well-known labels that will be displayed on the https://pypi.org/project/django-debug-toolbar/ sidebar.

The list of labels is available here: https://packaging.python.org/en/latest/specifications/well-known-project-urls/#well-known-labels

I think the changes would be helpful at a minimum.

[andoriyaprashant]

Hello @tim-schilling I would like to work on this issue. Could you please assign it to me

Thank you