Also, re-use some of the color variables while at it.
Co-authored-by: EloquentShashank <52653070+EloquentShashank@users.noreply.github.com>
- reduced filesize by ~100kb - splited _mixins into seperate files - replaced `@extend`'s - added split css files (core, components, extra-components, ...) - changed cursor style for .btn.disabled - enhanced package.json css* scripts