Add documentation on themes, move some themes around

Docs/Themes/maproulette.md

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+
+
+ MapRoulette Tasks ( maproulette) 
+----------------------------------
+
+
+
+Theme showing MapRoulette tasks, allowing you to search, filter and fix them.
+
+This theme contains the following layers:
+
+
+
+  - [maproulette](../Layers/maproulette.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
+  - fr
+  - da
+  - ca
+  - pa_PK
+ 
+
+This document is autogenerated from [assets/themes/maproulette/maproulette.json](https://github.com/pietervdvn/MapComplete/blob/develop/assets/themes/maproulette/maproulette.json)