add header

Author: wvictor14

_quarto.yml

@@ -1,7 +1,9 @@
 project:
   type: website
-
+  
 website:
+  body-header: |
+    This submission won the <a href="https://posit.co/blog/winner-of-the-2025-plotnine-plotting-contest/" target="_blank">2025 Plotnine Contest by Posit</a>
   favicon: logo.svg
   navbar:
     search: false