Change sidebar ad to June 2023 webinar

Author: red-patience

_includes/layouts/webinar_plug.html

@@ -1,5 +1,5 @@
 
-    <a href="https://plotly.com/careers/?utm_medium=graphing_libraries&utm_content=sidebar" target="_blank">
-      <img src="https://images.prismic.io/plotly-marketing-website/a9ba884c-ee2c-40f9-9c39-809ea1b5aac7_dash_doc_banner_career-01+%281%29.jpg?auto=compress,format"
-      style="width: 200px; height: 200px; position: fixed; bottom: 10px; left: 50px" alt="View all the positions that Plotly is hiring for!">
+    <a href="https://go.plotly.com/dash-in-action?utm_source=Webinar%3A+Dash+in+Action+6%2F7%2F23&utm_medium=graphing_libraries&utm_content=sidebar" target="_blank">
+      <img src="https://images.prismic.io/plotly-marketing-website-2/c09166b6-8eb3-4bf3-9c8c-48c84d45fd06_forum_ads_6.7.jpg?auto=compress,format"
+      style="width: 200px; height: 200px; position: fixed; bottom: 10px; left: 50px" alt="Sign up for the upcoming webinar: Dash in Action">
     </a>