Add documentation on themes, move some themes around

Docs/Themes/surveillance.md

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+
+
+ Surveillance under Surveillance ( surveillance) 
+-------------------------------------------------
+
+
+
+On this open map, you can find surveillance cameras.
+
+This theme contains the following layers:
+
+
+
+  - [walls_and_buildings](../Layers/walls_and_buildings.md)
+  - [direction](../Layers/direction.md)
+  - [surveillance_camera](../Layers/surveillance_camera.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_surveillance_camera](../Layers/note_import_surveillance_camera.md)
+
+
+Available languages:
+
+
+
+  - en
+  - nl
+  - ja
+  - zh_Hant
+  - fr
+  - de
+  - it
+  - hu
+  - ca
+  - nb_NO
+  - da
+ 
+
+This document is autogenerated from [assets/themes/surveillance/surveillance.json](https://github.com/pietervdvn/MapComplete/blob/develop/assets/themes/surveillance/surveillance.json)