docs: add warning about dynamic import of css

[InerkyJad]

The warning is regarding the use of dynamic imports inside of the script tag, it's related to #21803

🔗 Linked issue

❓ Type of change

• 📖 Documentation (updates to the documentation, readme or JSdoc annotations)
• 🐞 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)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

📝 Checklist

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

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[MuhammadM1998]

Hello,
Maybe you can add an example of a static import ( import "./style.css) too as the current line maybe confusing.

Is this seems better?

Make sure to use a **synchronous** import `import "./style.css` instead of a **dynamic** import `import("~/assets/style.css")` for server-side compatibility.

[florian-lefebvre]

I agree with @MuhammadM1998, adding an example of synchronous import is less confusing. Could you add it?

[florian-lefebvre]

@Hebilicious can you review?

[danielroe]

Maybe add this as a comment to the existing example of synchronous import above on L21?

[danielroe]

Thank you - perfect!