Remove dead code.

Signed-off-by: tungpham31 <tungpham31@gmail.com>
Fix bug enrolling in join courses.

Signed-off-by: tungpham31 <tungpham31@gmail.com>
Hacky way to fix bug updating course permission.

Signed-off-by: tungpham31 <tungpham31@gmail.com>
Merge branch 'release_v1.0' into newView
partially implemented mentions