chore: migrate node-sass to dart-sass

[ocavue]

I can't install node-sass on my M1 MacBook, so I migrate it to dart-sass, since node-sass is deprecated anyway.

References:

• https://sass-lang.com/blog/libsass-is-deprecated
• https://stackoverflow.com/questions/68095626/node-sass-with-apple-m1-big-sur-and-arm64