Merge pull request #377 from plotly/aug-2025-webinar-ad

Change sidebar ad to Aug 2025 webinar

Author: red-patience

_includes/layouts/webinar_plug.html

@@ -1,5 +1,5 @@
 
-    <a href="https://go.plotly.com/let-your-data-vibe?utm_medium=graphing_libraries&utm_campaign=studio_cloud_launch&utm_content=sidebar" target="_blank">
-      <img src="https://images.prismic.io/plotly-marketing-website-2/aFW_03fc4bHWilN6_PlotlyStudioCloudWebinar_Square.jpg?auto=format,compress"
-      style="width: 200px; height: 200px; position: fixed; bottom: 10px; left: 50px" alt="Let Your Data Vibe: From Dataset to Data App with Agentic Analytics">
+    <a href="https://app.livestorm.co/plotly/from-spreadsheet-to-spectacular?utm_medium=graphing_libraries&utm_campaign=spreadsheet_to_spectacular&utm_content=sidebar" target="_blank">
+      <img src="https://images.prismic.io/plotly-marketing-website-2/aG6ir0MqNJQqHuxv_FromSpreadsheettoSpectacular_Square.jpg?auto=format,compress"
+      style="width: 200px; height: 200px; position: fixed; bottom: 10px; left: 50px" alt="Register for the upcoming event: From Spreadsheet to Spectacular">
     </a>