Add documentation on themes, move some themes around

Docs/Themes/drinking_water.md

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+
+ Drinking Water ( drinking_water) 
+----------------------------------
+
+
+
+On this map, publicly accessible drinking water spots are shown and can be easily added
+
+This theme contains the following layers:
+
+
+
+  - [drinking_water](../Layers/drinking_water.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_drinking_water](../Layers/note_import_drinking_water.md)
+
+
+Available languages:
+
+
+
+  - en
+  - nl
+  - fr
+  - ru
+  - ja
+  - zh_Hant
+  - it
+  - de
+  - nb_NO
+  - hu
+  - ca
+  - es
+  - da
+  - pa_PK
+ 
+
+This document is autogenerated from [assets/themes/drinking_water/drinking_water.json](https://github.com/pietervdvn/MapComplete/blob/develop/assets/themes/drinking_water/drinking_water.json)