This also styles those inner .banner_message elements to lose
margin inherited from Bootstrap. (This is now also applied to
the upload-message banner.)
It's better to achieve that with a class selector; using a `p`
element selector would mean that such a style would be evaluated
for all `<p>` elements in the DOM. Which is of course a whole lot,
thanks to Markdown alone.
Fixes: #26922
Ever since we started bundling the app with webpack, there’s been less
and less overlap between our ‘static’ directory (files belonging to
the frontend app) and Django’s interpretation of the ‘static’
directory (files served directly to the web).
Split the app out to its own ‘web’ directory outside of ‘static’, and
remove all the custom collectstatic --ignore rules. This makes it
much clearer what’s actually being served to the web, and what’s being
bundled by webpack. It also shrinks the release tarball by 3%.
Signed-off-by: Anders Kaseorg <anders@zulip.com>