Compare https://meta.wikimedia.org/wiki/Tech#Color_of_red_links_across_Mediawiki (where first reported) with https://en.wikipedia.org/wiki/Wikipedia:Red_link
The core definition of red links for all skins is `#d33`, which is part of the [[ https://design.wikimedia.org/style-guide/visual-style_colors.html | Wikimedia Design Style Guide color palette ]].
In Vector (legacy) this was overriden to `#ba0000` for normal 'new' ('red') and `#a55858` for visited new links (and normal Vector tabs new links).
=== Acceptance criteria
 Vector (legacy) should show `#ba0000` for normal 'new' ('red') links
 Vector (legacy) should turn color to `#a55858` for visited 'new' ('red') links
 Vector (legacy) should show `#a55858` on Vector Tabs new links, like empty Discussion pages, both in normal and visited state
 Vector (modern) should be unchanged and have `#d33` for normal 'new' ('red') links