Feat: Stations map from locations

TBD: what is a "station"? We have

• sites
  • location type: polygon
  • might have sub-sites
  • configuration locations might be in / associated with site
• configurations
  • location type: point
  • might be associated with a site
  • are the providers of locations

I think a viable approach would be to

• extract everything by iterating all sites and configurations
• maybe filter by permission group / institute to keep the result manageable
• put this all this in a geojson file for a quick-and-dirty visualization on some platform like geojson.io