add ember-paper addon to the project

[umitozturk]

Github: https://github.com/miguelcobain/ember-paper#readme
Docs: https://miguelcobain.github.io/ember-paper/

Errors occured locally after installed ember-paper addon. Then I solved it.

Error prompt(70 times):

Deprecation Warning: Using / for division outside of calc() is deprecated and will be removed in Dart Sass 2.0.0.
Recommendation: math.div($layout-gutter-width, 2) or calc($layout-gutter-width / 2)
More info and automated migrator: [https://sass-lang.com/d/slash-div](https://sass-lang.com/d/slash-div)

and I solved it with:
npx sass-migrator division **/*.scss

references:
twbs/bootstrap#34051
https://github.com/sass/migrator

note that:
this addon is not working on ember 3.2.7 or later.

you can read my comment on this topic via this link, miguelcobain/ember-paper#1202 (comment)