Docs: Geoanalysis - Aggregate Points

[UJehle]

### Tasks
- [x] Draft (Irem)
- [x] Check (Ulrike)
- [x] Adjustments (Irem)
- [ ] Final Check & Additions (Elias & Ulrike)

[UJehle]

Needs to be double-checked after final implementation (snyc. with dev-team)

[iremkapucuoglu]

The example image needs an update. In the current image there are null values, avoid using null

[AnaSasso]

The example image needs an update. In the current image there are null values, avoid using null

@nihar1024 I think this has already been addressed

[nihar1024]

True, it looks fine to me.