Integrate MongoDB with NextJS frontend

[luarss]

Scope would be same as the MongoDB PR for streamlit: #107

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To be done after that PR is merged.

[krrish175-byte]

Hey @luarss : The current backend now uses PostgreSQL (per the README and docker-compose.yml). Should this issue be updated to integrate PostgreSQL with the NextJS frontend instead of MongoDB, or has the MongoDB integration been deprioritized?