Simplify Dependencies

[xavez]

I couldn’t get it to run locally yet, but I can already see we can probably simplify a lot of dependencies:

• [ ] Get rid of the ruby dependency by switching sass and compass to node-sass
• [ ] Get rid of the bower dependency by installing all necessary packages via npm

Unfortunately, I cannot code & test it, since nothing works for me yet, otherwise, I’d have made a PR ;).