Add documentation on themes, move some themes around

Docs/Themes/climbing.md

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+
+ Open Climbing Map ( climbing) 
+-------------------------------
+
+
+
+On this map you will find various climbing opportunities such as climbing gyms, bouldering halls and rocks in nature.
+
+This theme contains the following layers:
+
+
+
+  - [climbing_club](../Layers/climbing_club.md)
+  - [climbing_gym](../Layers/climbing_gym.md)
+  - [climbing_route](../Layers/climbing_route.md)
+  - [climbing_area](../Layers/climbing_area.md)
+  - [climbing_opportunity](../Layers/climbing_opportunity.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_climbing_club](../Layers/note_import_climbing_club.md)
+  - [note_import_climbing_route](../Layers/note_import_climbing_route.md)
+  - [note_import_climbing_area](../Layers/note_import_climbing_area.md)
+
+
+Available languages:
+
+
+
+  - en
+  - nl
+  - de
+  - ru
+  - ja
+  - zh_Hant
+  - nb_NO
+  - it
+  - fr
+  - hu
+  - ca
+  - da
+ 
+
+This document is autogenerated from [assets/themes/climbing/climbing.json](https://github.com/pietervdvn/MapComplete/blob/develop/assets/themes/climbing/climbing.json)