Re-introduce Algolia search

[AdamAWiener]

Description

Due to a testing and CI issue, Algolia was removed from Forgettable. Algolia is still a useful and valuable part of Forgettable so it would be good to get it working again!

Acceptance Criteria

• Re-introduce Algolia search to persons and encounters endpoints
• All existing tests pass

Implementation details

#316 Contains the removal of Algolia and its changelog should include the previous implementation. This can be used as a guide for re-introducing the removed functionality.

Testing notes

na

[hajineats]

Approved!

[jimwang6012]

LGTM!