Removed Comments And Deleted File

Removed a docstring in views.py in workouts folder.

Removed comments in models.py and admin.py in comments folder.

Deleted tests.py in comments folder due to removal of comment which was the last content of the file.
Empty files are not needed, and therefore, it was deleted.
1 job for backend/refactor/comments in 1 minute and 2 seconds (queued for 1 second)
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