feat: top level `content/` directory in Nuxt 4 compatibility version

[farnabaz]

🔗 Linked issue

resolves #2635

❓ 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

Nuxt v4 improved directory structure. This PR changes the base directory for all content sources from srcDir/ into rootDir/. When you set future.compatibilityVersion = 4 in nuxt.config the module will look for content directory in root Dir instead of app/ directory.

These change does not affect current projects.

📝 Checklist

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

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