workflows: removal of vendor files

* Removes unneeded vendor files from repo to be served
  by bower/grunt instead.

Co-authored-by: Jan Aage Lavik <jan.age.lavik@cern.ch>
Signed-off-by: Georgios Papoutsakis <georgios.papoutsakis@cern.ch>
bower: bower.json update

* Updates bower.json file to reflect current output of
  inveniomanage bower > bower.json.

Signed-off-by: Jan Aage Lavik <jan.age.lavik@cern.ch>