Add documentation on themes, move some themes around

Docs/Themes/maxspeed.md

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+
+
+ Maxspeed ( maxspeed) 
+----------------------
+
+
+
+This map shows the legally allowed maximum speed on every road. If a maxspeed is missing or wrong, you can correct it here.
+
+This theme contains the following layers:
+
+
+
+  - [maxspeed](../Layers/maxspeed.md)
+  - [speed_camera](../Layers/speed_camera.md)
+  - [speed_display](../Layers/speed_display.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_speed_camera](../Layers/note_import_speed_camera.md)
+  - [note_import_speed_display](../Layers/note_import_speed_display.md)
+
+
+Available languages:
+
+
+
+  - en
+  - es
+  - ca
+  - de
+  - fr
+  - da
+  - nl
+  - pa_PK
+ 
+
+This document is autogenerated from [assets/themes/maxspeed/maxspeed.json](https://github.com/pietervdvn/MapComplete/blob/develop/assets/themes/maxspeed/maxspeed.json)