feat: built-in client only component

[antfu]

🔗 Linked issue

nuxt/nuxt#11884

❓ 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

Add built-in <ClientOnly/> component (taken from VitePress).

📝 Checklist

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

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[antfu]

I was thinking to add it to the docs, but I didn't find a way to place it. Do yo think we should create a new page like https://nuxtjs.org/docs/features/nuxt-components?

[pi0]

? I was thinking to add it to the docs, but I didn't find a way to place it. Do yo think we should create a new page like https://nuxtjs.org/docs/features/nuxt-components?

A "Built-in components" page might be good idea (but we can also add it in a later PR)