🔥 Remove old fetch-congregation; no more access gis-db
🔥 Remove old fetch-congregation; no more access gis-db

Why:
- Refactoring towards event sourced territories
- It was tested that both implementations returned the same data, so the
  old one can now be removed
- Using `sequence` to always return a collection, instead of possibly
  returning `nil`, and it's faster than `vec` which requires copying

orfjackal/territory-bro,orfjackal/territory-bro,orfjackal/territory-bro