Update README.md

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 * Raspberry Pi: [https://raspberrypi.social](https://raspberrypi.social/explore)

 ## Opensource project / communities
+* Grafana: [https://grafana.social](https://grafana.social/explore)
 * OSM (Openstreetmap) community: [https://en.osm.town](https://en.osm.town/explore)

 ## Corporate / Commercial