issue#7 Improved color contrast for links and headings

[ankurO7]

💡 Description:

This PR enhances accessibility across the app by improving the color contrast of links and heading elements to meet WCAG 2.1 AA standards. The update ensures better readability and usability for all users, especially those with visual impairments.

🔧 Changes Made:

1. Updated CSS variables / Tailwind classes to use higher-contrast blue and gray shades.
2. Ensured all links and headings achieve at least 4.5:1 contrast ratio.
3. Verified design consistency across light and dark modes.
4. Confirmed compliance using browser dev tools and accessibility checker extensions.

Tested on Lighthouse. Results are displayed in Screenshots.

📸 Screenshots :

[vercel]

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