Merge pull request #359 from plotly/march-25-webinar-ad

Swap sidebar ad to March 2025 webinar

Author: red-patience

_includes/layouts/webinar_plug.html

@@ -1,5 +1,5 @@
 
-    <a href="https://go.plotly.com/dash-club?utm_source=Dash+Club+2022&utm_medium=graphing_libraries&utm_content=sidebar" target="_blank">
-      <img src="https://images.prismic.io/plotly-marketing-website-2/7953022d-73b1-481e-8f6b-9ce9bd80e588_Dash+Club.jpeg?auto=compress,format"
-      style="width: 200px; height: 200px; position: fixed; bottom: 10px; left: 50px" alt="Sign up to Dash Club to get two free cheat sheets as well as tips and tricks, community apps, and deep dives delivered every two months">
+    <a href="https://go.plotly.com/build-production-data-apps-your-way?utm_source=Webinar:%20AI-Powered%20Storytelling%203/18/2025&utm_medium=graphing_libraries&utm_content=sidebar" target="_blank">
+      <img src="https://images.prismic.io/plotly-marketing-website-2/Z74L1J7c43Q3gN9A_production-data-apps-Square_ads.jpg?auto=format,compress"
+      style="width: 200px; height: 200px; position: fixed; bottom: 10px; left: 50px" alt="Sign up for the upcoming webinar: Build Production-Grade Data Apps Your Way">
     </a>