Add NPM package

[rfoel]

I think it would be nice to have a NPM package, way easier to work with.

[Kinark]

I'll probably add it soon, I'm going to have some help too :)

I'll keep this issue open until NPM integration is done.

[rfoel]

@Kinark Great. I'd still use SASS instead of CSS. I'd be happy to help if needed.

[bastianwegge]

@rfoel feel free to make a PR for SASS integration. I think we can somehow talk @Kinark into using it ;)

[Kinark]

@TetianaP PR merged! NPM package is already avaible :)