Refactor: import nixpkgs via module's config.nixpkgs

[netlify[bot]]

✅ Deploy Preview for tweag-jupyterwith ready!

Name	Link
🔨 Latest commit	0f23b599feac6738a348f43235ce48be54e199c3
🔍 Latest deploy log	https://app.netlify.com/sites/tweag-jupyterwith/deploys/63e2b6023fe8a30008ec635b
😎 Deploy Preview	https://deploy-preview-425--tweag-jupyterwith.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site settings.