fix(nuxt, nuxi): improve pages creation and removal dx

[pi0]

🔗 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

Fixes some issues when creating and removing pages directory:

• When pages directory is empty (in all layers), and no explicit options.pages provided, module self-disables
• When pages is disabled, a placeholder <NuxtPage> with default slot takes in place and warns to create pages/index.vue
• Nuxi restarts when pages is disabled and there are some files inside pages OR when pages is enabled and there is no files in pages directory on watch events containing pages/** path

📝 Checklist

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

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[Atinux]

Beautiful work :)

Is there a chance we can get the logs from the Vue app on SSR and apply the same formatting as we do with consola?