Move dark/light theme toggle from footer to header for better accessibility

[krishx06]

Overview:
The dark/light theme toggle on tailwindcss.com is currently placed in the footer, making it easy to miss.
Users typically expect theme toggles near the top navigation bar for quick access.

Problem:

• The theme toggle is not visible immediately when visiting the site.
• Most users expect theme toggles to be located near the top navigation bar, next to documentation or GitHub links.
• Having to scroll to the bottom each time makes it less accessible and slightly reduces UX fluidity, especially for frequent visitors who prefer a specific theme.

Suggestion:
Relocate the theme toggle to the header or top navigation area to make it more discoverable and accessible without scrolling.

Benefits:

• Improves UX and accessibility
• Aligns with standard placement used by other dev sites (Next.js, Vercel, React.dev)

Note:
I’d be happy to take this up as an issue and open a PR if the team agrees with the idea.