* No benefit to having actiontext css as scss

* Update test

* Update docs

* No more css assets to be generated

New world, new CSS frameworks, new needs.

* SCSS is becoming optional

* Remove Sass as a default-on setting

But continue to make it easy to add.

* Update docs

* No longer used

* Update tests

* Update docs

* Update docs

* No longer used

* No longer by default

* Fix tests

* Promote Tailwind CSS as an alternative to Sass

* Fix test and copy task

* Update railties/lib/rails/generators/rails/app/templates/Gemfile.tt

Co-authored-by: Kevin Newton <kddnewton@gmail.com>

Co-authored-by: Kevin Newton <kddnewton@gmail.com>