Add documentation on themes, move some themes around

Docs/Themes/maps.md

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+ A map of maps ( maps) 
+-----------------------
+
+
+
+On this map you can find all maps OpenStreetMap knows - typically a big map on an information board showing the area, city or region, e.g. a tourist map on the back of a billboard, a map of a nature reserve, a map of cycling networks in the region, ...) <br/><br/>If a map is missing, you can easily map this map on OpenStreetMap.
+
+This theme contains the following layers:
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+
+
+  - [map](../Layers/map.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_map](../Layers/note_import_map.md)
+
+
+Available languages:
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+
+
+  - en
+  - nl
+  - fr
+  - ja
+  - zh_Hant
+  - ru
+  - de
+  - eo
+  - it
+  - nb_NO
+  - ca
+  - es
+ 
+
+This document is autogenerated from [assets/themes/maps/maps.json](https://github.com/pietervdvn/MapComplete/blob/develop/assets/themes/maps/maps.json)