Add documentation on themes, move some themes around

Docs/Themes/mapcomplete-changes.md

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+
+ Changes made with MapComplete ( mapcomplete-changes) 
+------------------------------------------------------
+
+
+
+This maps shows all the changes made with MapComplete
+
+This theme contains the following layers:
+
+
+
+  - [mapcomplete-changes](../Layers/mapcomplete-changes.md)
+  - [current_view](../Layers/current_view.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
+ 
+
+This document is autogenerated from [assets/themes/mapcomplete-changes/mapcomplete-changes.json](https://github.com/pietervdvn/MapComplete/blob/develop/assets/themes/mapcomplete-changes/mapcomplete-changes.json)