docs(quick-start): clarify using nuxt.config to disable shims

[Jiangmenghao]

🔗 Linked issue

none

❓ 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

For newcomers, when they first see the defineNuxtConfig section, they don't know in which file to modify the configuration, it would be better if the path to the file is given

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📝 Checklist

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

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[pi0]

THanks!