fix: align markup syntax with vscode

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• Adjusts the numbered markup.heading colors to align with VSCode's numbered markdown heading colors, and removed the markup.heading.marker styling that should instead by supplied by the numbered markup.heading capture. This technically depends on Improve markdown heading highlights helix-editor/helix#12417 upstream at Helix.

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• Changes markup.list from mauve to teal (numbered lists in markdown such as 1. foo 2. bar).

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• markup.bold and markup.italic are now red as well as their previous styles (italic and bold text ofc).

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• markup.link.text, the title of links in markdown, is now lavender instead of blue.

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• markup.raw is green instead of flamingo.

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• Add new entry for markup.quote that sets it to pink.

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