Add demo dashboard link to maps docs

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: torimwhaley

references/chart-types/map.mdx

@@ -4,6 +4,12 @@ description: "Use maps to display geographic data on an interactive map."
 icon: "earth-europe"
 ---
 
+<a href="https://demo.lightdash.com/projects/d496d901-a76d-4916-9eae-b81bc7337013/dashboards/c24ef37d-6a28-451d-b414-641595684f23/view" target="_blank">
+  <Card title="See maps in action" icon="arrow-up-right-from-square" horizontal>
+    Explore an interactive demo dashboard with scatter maps, area maps, and heatmaps.
+  </Card>
+</a>
+
 ![map](/images/references/chart-types/map/map-chart.png)
 
 <Info>