Added placeholders for  examiners to add video solutions for questions ...
Shared workbench moved to within examiners/

An admin is an examiner with a few more priviliges - thats all.
And therefore, the shared workbench is housed within examiners/
[Examiner console]: First draft of framework to add video solutions to questions ...

TBD: pagination and actual question <-> video tagging
.single-line > tag given a little more space
Minor edit