Make code tags consistent in discussions

Problem

• Sometimes code tags get misused to emphasize something, which should be done by using bold
• The visual index of code blocks is much higher compared to other markdown content
• Inline code blocks and normal code blocks are inconsistent

Proposal

old:

new:

• #f2f2f2 and #2e2e2e
• Lose the border on normal code-blocks

Considerations

• Passes color check with #f2f2f2 and #2e2e2e: https://webaim.org/resources/contrastchecker/?fcolor=2E2E2E&bcolor=F2F2F2
• The normal codeblock is adjusted by the Syntax highlighting theme, we should see if this works well for similarly for the other themes

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cc:

• @tauriedavis (as you have done previous work on the markdown/typography)
• @pedroms (as you have been involved with our color management)