Pull Request: C4_Mussab_410_Story_4.1_Reopen Collapse-able_and_Student_Count_on_Problem

@MohabGhanim @ahmed93 @Mamdou7 @AhmedElassuty 
Please Review
Goto
/course/:id
/topics/:id
/tracks/:id

The ids are preferable to be 1 because it has a lot of thing to be tested on
The bar now is not clickable and the arrow is the thing that is clicked to expand and collapse the list
In the and singed in as student there will be the number of students that solved this problem successfully