[rec] Implement recommendation algorithm (#88)

* working on embeddings

* working on recently viewed

* recommended stories bug

* fix(recommendations): uses query response directly for recommendations

* finished implementing recommendation alg

* Small merge changes

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Co-authored-by: Kyle Ramachandran <[email protected]>
Co-authored-by: Noah Hernandez <[email protected]>
Co-authored-by: Aditya Pawar <[email protected]>
Co-authored-by: Aditya Pawar <[email protected]>