Improve Footer UI/UX: Contrast, Spacing, and Visual Hierarchy

[nihal-soni]

Describe the Bug.

Reproduction Steps

1. Open the Payload website.
2. Scroll down to the footer.
3. Observe readability, spacing, and alignment on desktop and mobile.

Environment Info

Payload: N/A (observed on official site)
Node.js: N/A
Next.js: N/A