Add documentation on themes, move some themes around

Docs/Themes/healthcare.md

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+
+
+ Healthcare ( healthcare) 
+--------------------------
+
+
+
+On this map, various healthcare related items are shown
+
+This theme contains the following layers:
+
+
+
+  - [doctors](../Layers/doctors.md)
+  - [hospital](../Layers/hospital.md)
+  - [pharmacy](../Layers/pharmacy.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_doctors](../Layers/note_import_doctors.md)
+  - [note_import_pharmacy](../Layers/note_import_pharmacy.md)
+
+
+Available languages:
+
+
+
+  - en
+  - ca
+  - de
+  - fr
+  - da
+  - nl
+  - pa_PK
+ 
+
+This document is autogenerated from [assets/themes/healthcare/healthcare.json](https://github.com/pietervdvn/MapComplete/blob/develop/assets/themes/healthcare/healthcare.json)