OR-445 remove perfect_scrollbar, not use anymore
Merge pull request #344 in OR/rse from ~SLEMAISTRE/rse:OR-445-true to master

* commit '8c5ea9224f10b32218176a9cccf70c8d514f78ab':
  OR-445 remove perfect_scrollbar, not use anymore
OR-445 Also remove .css and .js files of perfect-scroll bar'