Add documentation on themes, move some themes around

Docs/Themes/ghostbikes.md

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+ Ghost bikes ( ghostbikes) 
+---------------------------
+
+
+
+A <b>ghost bike</b> is a memorial for a cyclist who died in a traffic accident, in the form of a white bicycle placed permanently near the accident location.<br/><br/>On this map, one can see all the ghost bikes which are known by OpenStreetMap. Is a ghost bike missing? Everyone can add or update information here - you only need to have a (free) OpenStreetMap account.
+
+This theme contains the following layers:
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+
+
+  - [ghost_bike](../Layers/ghost_bike.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_ghost_bike](../Layers/note_import_ghost_bike.md)
+
+
+Available languages:
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+
+
+  - en
+  - nl
+  - de
+  - ja
+  - nb_NO
+  - zh_Hant
+  - fr
+  - eo
+  - es
+  - fi
+  - gl
+  - hu
+  - it
+  - pl
+  - pt_BR
+  - ru
+  - sv
+  - da
+  - ca
+ 
+
+This document is autogenerated from [assets/themes/ghostbikes/ghostbikes.json](https://github.com/pietervdvn/MapComplete/blob/develop/assets/themes/ghostbikes/ghostbikes.json)