With the redesign of all popovers completed, we have transitioned away
from the legacy Bootstrap-based popover system. As a result, the
Bootstrap `nav nav-list` classes are now obsolete and no longer used
in the codebase.
This commit, a part of the efforts to clean up the legacy Bootstrap CSS,
removes these unused classes and any related CSS workarounds.
Fixes#26990.
Happily, every last CSS property in these styles is already
described for the places <pre> appears in the Zulip UI:
1. In rendered message markdown
2. In the compose preview
3. In the information overlay (Message formatting)
The `line-height` value is set to `inherit` in zulip.css, rendering
this line moot. `inherit` will always force list items to take
their line height from the nearest ancestor that sets one.
* `font-size: 100%` is unnecessary, as `font-size: 16px` is set on
the `body` selector.
* `text-size-adjust` is unnecessary, as supporting browsers appear
to use `100%` as a default value anyway.
Sayam Samal
Aman Agrawal
Karl Stolley
Sahil Batra
Tim Abbott