style(tailwind colors): add custom tailwind colors in index file

[magali-la]

🎯Type of Change:

• Style 🎨: Code formatting or aesthetic changes (CSS).

This PR...

Add 6 custom tailwind colors and names to the index.css file.

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📝 What I Did:

• Extracted hex codes from Figma design files
• Added theme utility class to index.css file and the colors

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🧪 How to Test:

1. Run git checkout style/tailwind-colors
2. Create divs with the custom colors in App.jsx and verify the names pop up automatically

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🤔 What I learned:

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[nkabembo]

Ready to merge