Use sass instead of node-sass in scss-config-webpack-plugin

[danielkoch]

[ ] Regression (a behavior that used to work and stopped working in a new release)
[ ] Bug report  
[ ] Performance issue
[x] Feature request
[ ] Documentation issue or request
[ ] Support request

Current behavior

sass-loader highly recommend using Dart Sass because of performance, limited feature support, ...

Expected behavior

Switch to dart-sass