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There are two problems here. The first is Django-related:
ImportError: No module named team-app.wsgi
Your wsgi.py file is located in the users_groups/ directory so your Procfile should reference users_groups.wsgi:
web: gunicorn users_groups.wsgi --log-file -
The name of the top-level directory that contains the entire project is irrelevant.
The second problem is Heroku-related. Heroku expects the Django directory to be the root of your repository. Moving Procfile into src/, then running heroku local web should get you up and running locally.
When you deploy to Heroku you’ll have to make sure your current src/ directory is your root directory. That may mean moving some files into src/ and recreating / refactoring your Git repository there, or it could mean moving everything that’s currently in src/ up a level.