Searching per category

[hero101]

Description

As a
I want
So that

Acceptance criteria

• Backend does multi-search in different sources per category, instead of once in everything
• Backend enforces a hard limit 25 max results per category
• API to support filtering by source
• Frontend to support filtering by category (can include multiple sources per category)

Additional Context

Screen shots / UX designs / data that are relevant.

Areas that will be affected

To be added during the refinement