fix: mention color in DMs

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What does this PR do?

🤖 Generated by Copilot at 942324b

Removed the unused matchOnlyUrl prop from the Markup component and added a CSS rule to improve the slug color of linkified messages. These changes simplify the component interface and enhance the message readability.

Related issues

Fixes # (issue)

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Enhancement (non-breaking small changes to existing functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Explanation of the changes

🤖 Generated by Copilot at 942324b

• Remove matchOnlyUrl prop from Markup component interface (link)
• Add CSS rule to override slug color of linkified messages (link)

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ENG-56