docs: external configuration table

[nathanchase]

🔗 Linked issue

#9188

❓ Type of change

• [x] 📖 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

This is an attempt to help clarify how common external packages/modules/scripts are configured with Nuxt 3, as referenced at https://github.com/nuxt/framework/pull/9181#issuecomment-1320899406

Here's a preview of how it might appear:

I also asked in Discord for community feedback on this: https://discord.com/channels/473401852243869706/897487139888062506/1043551067197165598

📝 Checklist

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

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[nathanchase]

Thanks @danielroe & @HigherOrderLogic - changes have been committed.

[pi0]

Thanks for working on this @nathanchase ❤️

I've pushed a few refactors to simplify and improve readability and also only include relevant to Nuxt 3 files.