feat: spa mode

[farnabaz]

🔗 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)
• [x] ✨ New feature (a non-breaking change that adds functionality)
• [ ] ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

TODO:

• [x] prevent fetching contents on the second visit
• [ ] improve guard to enable local dg only on generated websites (with nuxi build and running server we do not need local DB and still can fetch contents from API)

📝 Checklist

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

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[farnabaz]

Merging this to test on edge channel.