workflows: blank slate for require.js

It 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.

Related to: inveniosoftware/invenio#1971