fix: improve landing page accessibility

[mysterio-Apoorva]

Summary

This PR improves accessibility and readability across the landing page by increasing text contrast and improving visibility of interactive elements.

Changes

• Improved secondary CTA hover contrast
• Improved hero section text readability
• Increased visibility of statistics labels
• Added accessible footer link styles
• Improved footer text contrast

Type of Change

• Accessibility improvement
• UI enhancement

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[github-actions]

GSSoC Label Checklist 🏷️

@Umbrella-io — please apply the appropriate labels before merging:

Difficulty (pick one):

• level:beginner — 20 pts
• level:intermediate — 35 pts
• level:advanced — 55 pts
• level:critical — 80 pts

Quality (optional):

• quality:clean — ×1.2 multiplier
• quality:exceptional — ×1.5 multiplier

Validation (required to score):

• gssoc:approved — counts for points
• gssoc:invalid / gssoc:spam / gssoc:ai-slop — does not score

Type labels (type:*) are auto-detected from files and title. Review and adjust if needed.
Points formula: (difficulty × quality_multiplier) + type_bonus

[mysterio-Apoorva]

Implemented the requested accessibility improvements for the landing page. Happy to make any further adjustments if needed. Thanks for reviewing!

[mysterio-Apoorva]

Resolved merge conflicts and updated the PR accordingly.
Looking forward to feedback. Thank you!

[Priyanshu-byte-coder]

Three issues before this can merge:

1. Branch conflicts — the PR is currently in a conflicting state and needs to be rebased onto main.

2. Dead CSS class — a .lnd-footer-link class is added to globals.css but never applied in the JSX. The footer links still use inline style= attributes. Either wire up the new class in the component or remove it.

3. Questionable contrast change — CTA hover color changed from #fff to #000 on a purple background. Black text on purple may have worse WCAG contrast than white. Please verify the contrast ratio meets AA (4.5:1) before keeping this change.

Resolve the conflicts and fix these, then it's ready for re-review.