Use sass instead of node-sass

[kswedberg]

Thanks a lot for this useful nuxt module. Unfortunately, I'm trying to use nuxt-breaky in a project with node 16, but the node-sass version in your package.json isn't working with that node version.

I wonder if you would mind switching from node-sass to sass, since node-sass is deprecated? The same would need to be done in https://github.com/teamnovu/vue-breaky-core .

Maybe better yet, use css custom properties instead of sass mixins and avoid the issue altogether?

If you're amenable to the idea, I can create a pull request here and/or in vue-breaky-core