Fix the contrast of links and ensure we underline those links #2319
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This fixes some errors from my testing branch. I thought it might be a good idea to get these on a dedicated branch.
Explicitly it fixes https://dequeuniversity.com/rules/axe/4.9/color-contrast and
Ensure links are distinguished from surrounding text in a way that does not rely on color
which is part of WCAG 2.1 (A), WCAG 2.0 (A), WCAG 2.2 (A), Trusted Tester and EN 301 549Before and after images
This gives us at least a 5.40:1 contrast ratio on all backgrounds. Which is enough for the AA requirements.