This fixes some minor glitches with buttons:
* Movement of the organization-settings-parent block on the
appearance of widgets.
* Large and odd look of save button.
* Use of fadeIn and fadeOut rather than changing opacity as
opacity don't actually remove them.
This commit transitions all styles in app.css in the Django pipeline
to being compiled by webpack in an app-styles bundle, and renames the
various files to now be processed as SCSS.
To implement this transition, we move the old CSS file refernces in
settings.py and replace them with a bundle declared in
`webpack.assets.json` and includedn in the index.html template
Tweaked by tabbott to keep the list of files in `app.css` in
`webpack.assets.json`, and to preserve the ordering from the old
`settings.py`.
Shubham Dhama
Armaan Ahluwalia