How to import CSS from an npm package? #11
Description
The official ember-cli docs, and this ember atlas page
say to use app.import.
We don't want to encourage any usage of app.import, as it's archaic AF -- so, I think we should document how to use css @import in the app.css.
I think with embroider and ember-auto-import, it should "just work", but it'll be good to document, as we have no examples anywhere.