refactor(nuxt): replace Nuxt payload's error type with NuxtError

[DamianGlowala]

🔗 Linked issue

❓ Type of change

• [ ] 📖 Documentation (updates to the documentation, readme or JSdoc annotations)
• [ ] 🐞 Bug fix (a non-breaking change that fixes an issue)
• [x] 👌 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

Enforces a NuxtError type on the NuxtPayload's error property for consistency.

📝 Checklist

• [ ] I have linked an issue or discussion.
• [ ] I have added tests (if possible).
• [x] I have updated the documentation accordingly.

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[DamianGlowala]

Added! As the nuxt-error-page.vue isn't using TypeScript, we probably need to leave it as it is: https://github.com/nuxt/nuxt/blob/a995f724eadaa06d5443b188879ac18dfe73de2e/packages/nuxt/src/app/components/nuxt-error-page.vue#L9