DELETE Removes a drill from a course.
The removed drill will continue to exist in the repertoire of the author as a standalone drill.
This API call has not yet been implemented!
The following error situations are possible:
||400 (Bad request)||No course was specified|
||404 (Not found)||Course could not be found|
||403 (Forbidden)||You are not authorized to modify this course|
||400 (Bad request)||No drill was specified|
||400 (Bad request)||Given drill is not part of the course|