Fix color contrast ratio of links

[kaelig]

Links in the content area of the page have a color contrast ratio that doesn't meet WCAG 2.1 level AA.

[mattfelten]

Cutting it back to #a66206 on #f6f8f9 will be a contrast of 4.5. It will look more brown than gold though.

[jina]

my comments I left in Slack just now:

15:52 strange. my original colors i had checked. did they get updated?

15:53 oh, i think that’s the wrong mode link color

15:53 i have light and dark mode link colors

[kaelig]

@mattfelten is that something you can look into?

[mattfelten]

@kaelig Yeah, I'll figure out what happened