Web-app: Added slider when changing weight of assessment
Web-app: Moved libraries in right directory
Web-app: save tokens to session rather than db
Web-App: Moved data into the original config file
Revert "Updated schema"

This reverts commit c880e923acb6a5ee5eba5ff72140c2ce65d5062f.
Revert "Updated schema"

This reverts commit 5fb22038eca6b3087cae080d3846ac4cbfdc12a3.
Web-app:Fixed a bug when removing students from group