Personal boilerplate project.
Yarn is used as a front end package manager.
just run yarn install
and you're good to go.
There is no special loader for scss. I use Phpstorm's built in "file watcher" functionality to transform scss to css (to location: public/css/main.min.css).
Included (imported to be more exact) in main.scss you will see _assets/sass/media.scss which is a project you can find here: https://github.com/sass-mq/sass-mq
I find it very usefull for my projects.
Both index.html and index.php are included. Depending on my needs I always delete one.