Chore: update docs

Docs/Themes/ski.md

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+[//]: # (WARNING: this file is automatically generated. Please find the sources at the bottom and edit those sources)
+
+ Ski pistes and aerialways ( [ski](https://mapcomplete.org/ski) ) 
+------------------------------------------------------------------
+
+
+
+Everything you need to go skiing
+
+This theme contains the following layers:
+
+
+
+  - [ski_piste](../Layers/ski_piste.md)
+  - [aerialway](../Layers/aerialway.md)
+  - [guidepost](../Layers/guidepost.md)
+  - [map](../Layers/map.md)
+  - [information_board](../Layers/information_board.md)
+  - [mountain_rescue](../Layers/mountain_rescue.md)
+  - [toilet](../Layers/toilet.md)
+  - [drinking_water](../Layers/drinking_water.md)
+  - [food](../Layers/food.md)
+  - [viewpoint](../Layers/viewpoint.md)
+  - [binocular](../Layers/binocular.md)
+  - [selected_element](../Layers/selected_element.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)
+  - [range](../Layers/range.md)
+  - [last_click](../Layers/last_click.md)
+  - [favourite](../Layers/favourite.md)
+
+
+Available languages:
+
+
+
+  - en
+ 
+
+This document is autogenerated from [assets/themes/ski/ski.json](https://github.com/pietervdvn/MapComplete/blob/develop/assets/themes/ski/ski.json)