workflows: blank slate for require.js

* Sets aside all the JavaScript for Holdingpen and prepare the files for
  a fresh (re)start. See what you can do with that. All the hp_* files
  are beyond repair. Sorry mate.

* Do whatever you want with it, you can even: $ git reset --soft HEAD^
  if you like. It's all yours.

Signed-off-by: Yoan Blanc <yoan.blanc@cern.ch>