chore: update CodeSandbox links

[acekyd]

🔗 Linked issue

❓ 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

Hello team!

In this PR, I updated the links for the starter CodeSandbox projects to the new version of CodeSandbox. This is a more smooth experience, and should also work faster and more consistently with the local environment.

These are the new links:

• Nuxt Starter: https://codesandbox.io/p/github/nuxt/starter/v3-codesandbox
• Nuxt Bridge: https://codesandbox.io/p/github/nuxt/starter/v2-bridge-codesandbox
• Vue 3 SSR starter: https://codesandbox.io/p/github/nuxt-contrib/vue3-ssr-starter/main

📝 Checklist

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

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[pi0]

Thanks!