sass gem is deprecated

[DamienRobert]

The sass gem is deprecated since March 2019, a replacement is sassc based on libsass.
In content_processor/sass.rb you provide custom importers. The api in sassc seems to have changed (there is a Sassc::Importer rather than a Sass::Importers), so I don't know how easy this would be to adapt.

[gettalong]

I have had a look the current implementation and the new sassc gem. The API really seems to have changed, especially the Importer API. I don't think that I can implement the same functionality with the current sassc gem...

I will keep an eye on it. The latest version of sass was released in April this year, so we should be good for some time.