feat: add github colorblind themes

[Z1xus]

Summary

adds github dark colorblind and github light colorblind themes to improve accessibility for users with protanopia and deuteranopia

Related Issues

closes #15503

Details

colors taken from github's primer design system

How to Validate

after building start the cli and switch themes in settings to Github Dark Colorblind and Github Light Colorblind

Pre-Merge Checklist

• Updated relevant documentation and README (if needed)
• Added/updated tests (if needed)
• Noted breaking changes (if any)
• Validated on required platforms/methods:
  • Windows
    • npm run

[gemini-code-assist]

Summary of Changes

Hello @Z1xus, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly enhances the application's accessibility by integrating two new colorblind-friendly themes. These themes, 'GitHub Dark Colorblind' and 'GitHub Light Colorblind,' are specifically tailored to assist users with protanopia and deuteranopia, ensuring a more inclusive user experience by providing optimized color palettes for code highlighting and UI elements.

Highlights

• New Colorblind Themes: Introduces two new themes, 'GitHub Dark Colorblind' and 'GitHub Light Colorblind', to the application.
• Accessibility Improvement: These themes are specifically designed to improve accessibility for users with protanopia and deuteranopia.
• Color Palette Source: The color schemes for the new themes are derived from GitHub's Primer design system.

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[gemini-code-assist]

Code Review

This pull request introduces two new colorblind-friendly themes, 'GitHub Dark Colorblind' and 'GitHub Light Colorblind', which is a great accessibility improvement. The implementation is correct, and the new themes are properly registered. My main feedback is about significant code duplication between the two new theme files. I've suggested a refactoring approach using a factory function to centralize the theme structure, which will improve long-term maintainability.