web: change `Breader` font weight
Created by: valerybugakov
Changes
- Divider
font-weight
is set to400
. - Removed
.theme-redesign
usage fromPageHeader
styles.
Screenshots
Before
After
Closes https://github.com/sourcegraph/sourcegraph/issues/21866. Part of https://github.com/sourcegraph/sourcegraph/issues/20847.