Full Delete Course

[AdamFipke]

We have an Archive Course button, but that course still exists and can still be accessed (just kinda hidden away).

I think some courses were probably accidentally made, so having a way to perma-delete courses would be nice.

Most of it can just be handled by ON DELETE CASCADE for stuff like user courses and questions and stuff. Just make sure to warn the user that "this will permanently delete everything to do with this course, including questions asked etc. Do this only if you accidentally created this course. Perhaps consider Archiving it instead.".

Make sure it deletes all associated chatbot documents and questions too in the chatbot database