fix (a11y): make code block colors WCAG AA color contrast compliant

[virus-rpi]

Changes:

• Changed the colors of the code block themes to WCAG AA color contrast compliant colors using https://app.contrast-finder.org

Before:

After:

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Lighthouse	1 paths audited Performance: 84 (🟢 up 1 from production) Accessibility: 100 (no change from production) Best Practices: 100 (no change from production) SEO: 93 (no change from production) PWA: 80 (no change from production) View the detailed breakdown and full score reports

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[hofmann-felix]

Awesome 🎨 I tested the changes with https://accessibe.com/accessscan. It is happy about the colors in this branch but complains about the colors in main