Add documentation on themes, move some themes around

Docs/Themes/osm_community_index.md

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+
+
+ OSM Community Index ( osm_community_index) 
+--------------------------------------------
+
+
+
+A list of resources for users of OpenStreetMap. 'Resources' can be links to forums, meetups, Slack groups, IRC channels, mailing lists, and so on. Anything that mappers, especially beginners, might find interesting or helpful.
+
+This theme contains the following layers:
+
+
+
+  - [osm_community_index](../Layers/osm_community_index.md)
+  - [gps_location](../Layers/gps_location.md)
+  - [gps_location_history](../Layers/gps_location_history.md)
+  - [home_location](../Layers/home_location.md)
+  - [gps_track](../Layers/gps_track.md)
+
+
+Available languages:
+
+
+
+  - en
+  - de
+ 
+
+This document is autogenerated from [assets/themes/osm_community_index/osm_community_index.json](https://github.com/pietervdvn/MapComplete/blob/develop/assets/themes/osm_community_index/osm_community_index.json)