Pull Request: C3_Saeed_533_Delete_Topic_1.34

Issue #533 

for scenario reviewers:-
Go to profile page.
Click "Courses".
Click "Manage Courses".
Select the course.
Click "Delete topic"

@Rania-Abdel-Fattah , @ranaelnagar , @Ahmed-Atef  , @Ahmed-Moataz , @ahmed93 please review me