Webpack code splitting will make the inclusion order of CSS files less
obvious, and we need to guarantee that these rules follow the rules
they override.
Signed-off-by: Anders Kaseorg <anders@zulipchat.com>
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`.
Anders Kaseorg
Armaan Ahluwalia