Add documentation on themes, move some themes around

Docs/Themes/cyclenodes.md

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+
+
+ Cycle Node Networks ( cyclenodes) 
+-----------------------------------
+
+
+
+This map shows cycle node networks and allows you to add new nodes easily
+
+This theme contains the following layers:
+
+
+
+  - [node2node](../Layers/node2node.md)
+  - [node](../Layers/node.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)
+
+
+Available languages:
+
+
+
+  - en
+  - de
+  - es
+  - nb_NO
+  - nl
+  - fr
+  - ca
+ 
+
+This document is autogenerated from [assets/themes/cyclenodes/cyclenodes.json](https://github.com/pietervdvn/MapComplete/blob/develop/assets/themes/cyclenodes/cyclenodes.json)