* Fix#2922 - Load stylesheet from "custom.css" entrypoint when present
This is pretty much the same way it worked as before, albeit with
having to create app/javascript/packs/custom.js with
require('../styles/custom.scss') (or whatever you want really), which
will be a blank slate for you to import whatever you want
* Remove old assets directory
* Extract font-awesome into common.css and always load it
* User can create a custom.scss to customize their instance without modifying gitted files.
* Add documentation for customization.
* Forgot the helper file
* Fix Style to pass codeclimate
* Requests from maintainer.
