Ruby Sass is deprecated

[weppos]

Ruby Sass is deprecated and will be unmaintained as of 26 March 2019.

* If you use Sass as a command-line tool, we recommend using Dart Sass, the new
  primary implementation: https://sass-lang.com/install

* If you use Sass as a plug-in for a Ruby web framework, we recommend using the
  sassc gem: https://github.com/sass/sassc-ruby#readme

* For more details, please refer to the Sass blog:
  http://sass.logdown.com/posts/7081811

[weppos]

From this thread: https://github.com/nanoc/nanoc/issues/1545#issuecomment-886008483

Ruby Sass indeed needs to be replaced in Nanoc, but I haven’t made much progress with it yet. sassc (and the associated libsass) are also deprecated, and are therefore not a good choice.

We could look into sassc https://gist.github.com/jarrodldavis/72d450c636ffed67a0a8a3c31d261387

[denisdefreyne]

@weppos

We could look into sassc

The sassc gem isn’t a great choice either, as it too is deprecated (because it uses the deprecated libsass).

[denisdefreyne]

FYI: I’m working on a :dart_sass filter: https://github.com/nanoc/nanoc/pull/1627

[sbastn]

Thank you @denisdefreyne. I was able to use the :dart_sass filter in another of our nanoc site. I'm going to apply the same changes here.