docs: update Tailwind CSS setup guide for v4 (2025) with legacy v3 support. #279
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This PR updates the Tailwind CSS setup guide to reflect the latest v4 installation process (2025) while preserving the original v3 steps used in the Sigma Web Development Course.
🔧 Changes made:
This update helps new learners get started with the latest Tailwind version, while still supporting those following the original (older) course videos.