The introduction of ".rendered_markdown table" in 00eaf3a, caused some
styling glitches in the "message formatting" overlay, such as an extra
right border and darker internal borders. This commit fixes these
glitches by duplicating bootstrap's table styles.
Fixes: #11573.
This moves help_table to informational-overlays.scss, replaces "," with
"or" and "P" with "shift + p" in order to be more clear and legible
this also improves the styling of the text.
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`.