Add documentation on themes, move some themes around

Docs/Themes/waste_assen.md

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+
+ Afval - Assen ( waste_assen) 
+------------------------------
+
+
+
+Kaart met afvalbakken en recyclingfaciliteiten + een dataset voor Assen.
+
+This theme contains the following layers:
+
+
+
+  - [waste_basket](../Layers/waste_basket.md)
+  - [waste_basket_assen](../Layers/waste_basket_assen.md)
+  - [recycling](../Layers/recycling.md)
+  - [recycling_assen](../Layers/recycling_assen.md)
+  - [waste_disposal](../Layers/waste_disposal.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_waste_basket](../Layers/note_import_waste_basket.md)
+  - [note_import_recycling](../Layers/note_import_recycling.md)
+  - [note_import_waste_disposal](../Layers/note_import_waste_disposal.md)
+
+
+Available languages:
+
+
+
+  - nl
+ 
+
+This document is autogenerated from [assets/themes/waste_assen/waste_assen.json](https://github.com/pietervdvn/MapComplete/blob/develop/assets/themes/waste_assen/waste_assen.json)