Configure Django to automatically compile SASS into CSS

[aubreypc]

If we ever want to modify the Bootstrap CSS, we will find it much less repetitive to instead modify the SASS files (https://sass-lang.com) which generate this CSS. In order to simplify this workflow, ideally there would be a way to use SASS directly in the Django templates. (This might help? https://github.com/jrief/django-sass-processor)