Add new dashboard example

Author: cderv

docs/gallery/dashboards/dashing-through-snow.png

@@ -169,7 +169,7 @@
       subtitle: Python
       href: https://mine.quarto.pub/dashing-through-snow-py/
       code: https://github.com/mine-cetinkaya-rundel/dashing-through-snow/
-      thumbnail: dashboards/ojs-flights.png
+      thumbnail: dashboards/dashing-through-snow.png
 
 - category: Websites
   description: |