docs: convert docs to undocs

[moshetanzer]

🔗 Linked issue

❓ Type of change

• [x] 📖 Documentation (updates to the documentation, readme, or JSdoc annotations)
• [ ] 🐞 Bug fix (a non-breaking change that fixes an issue)
• [x] 👌 Enhancement (improving an existing functionality like performance)
• [ ] ✨ New feature (a non-breaking change that adds functionality)
• [ ] 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• [ ] ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

Hi @Barbapapazes @danielroe,

Have done a basic swap over to undocs. Only actual change was features on homepage which needed a title and icon - also split lightweight and minimal in order for there to be equal amount of feature blocks on md screen.

Keep upi your great work!

Let me know your thoughts!

https://github.com/unjs/magic-regexp/issues/367

📝 Checklist

• [x] I have linked an issue or discussion.
• [ ] I have updated the documentation accordingly.

[moshetanzer]

closing this pr - was way too much of a mess - opening new one now 🙈 🙉

see PR https://github.com/unjs/magic-regexp/pull/383