Mention DartSass

[KittyGiraudel]

[tenhobi]

This is so cool improvement that they will make everything in Dart from scratch.

Btw. do you know what will happened with libsass? I only know they will abandon the Ruby version in favor of the Dart version for sure.

[KittyGiraudel]

LibSass will still be maintained. :)

[robsonsobral]

LibSass is behind DartSass.

[Klemart3D]

LibSass is deprecated since 2020: https://sass-lang.com/blog/libsass-is-deprecated.
Any mention of LibSass, ruby-sass, sacss, node-sass… must be removed from guidelines.
Sass-Compatibility table doesn't seem useful anymore.