docs: fix GitHub links to tailwindlabs org

[pavan-sh]

Summary

Fix outdated GitHub links that still point to github.com/tailwindcss/tailwindcss (old org). This updates references across the README, contributing guide, and PR template to the canonical tailwindlabs/tailwindcss URLs to avoid redirects/404s and keep repo metadata consistent

Test Plan

This change is docs-only.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

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Walkthrough

The changes update repository references across documentation files. Three files are modified: .github/CONTRIBUTING.md updates links to code formatting guidelines from the tailwindcss repository to tailwindlabs; .github/PULL_REQUEST_TEMPLATE.md updates the contributing link; and README.md updates the latest release badge URL, discussions page URL, and contributing documentation URL. All changes involve updating organization references from tailwindcss to tailwindlabs. No functional code changes are made. Total lines changed: 5 additions and 5 deletions.

🚥 Pre-merge checks | ✅ 2

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main change: updating GitHub links from the old tailwindcss org to the new tailwindlabs org across documentation files.
Description check	✅ Passed	The description clearly relates to the changeset by explaining the purpose of updating outdated GitHub links to avoid redirects and maintain consistency.

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[RobinMalfait]

Thanks!

[pavan-sh]

Thanks!

Happy to help!