Add documentation on themes, move some themes around

Docs/Themes/charging_stations.md

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+
+
+ Charging stations ( charging_stations) 
+----------------------------------------
+
+
+
+On this open map, one can find and mark information about charging stations
+
+This theme contains the following layers:
+
+
+
+  - [charging_station](../Layers/charging_station.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)
+  - [note_import_charging_station](../Layers/note_import_charging_station.md)
+
+
+Available languages:
+
+
+
+  - en
+  - id
+  - it
+  - ja
+  - zh_Hant
+  - nl
+  - de
+  - nb_NO
+  - ru
+  - hu
+  - ca
+  - fr
+  - es
+  - da
+  - pa_PK
+ 
+
+This document is autogenerated from [assets/themes/charging_stations/charging_stations.json](https://github.com/pietervdvn/MapComplete/blob/develop/assets/themes/charging_stations/charging_stations.json)