docs(api): add experimental --prerender flag to nuxi build command

[mishushakov]

🔗 Linked issue

No issue opened

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

Added prerender option to nuxi build command API docs

📝 Checklist

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

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[pi0]

Thanks for the PR @mishushakov. I initially added this flag for testing behavior but naming might be changes (to something like --static) which was why avoided documenting but since nuxi --help is already showing it, let's add with a note regarding stability status :)