add demo video link to control panel description

app.py

@@ -790,6 +790,8 @@ with gr.Blocks() as demo:
                     </a>
             """)
             gr.Markdown("This is a control panel for the [Pioreactor](https://pioreactor.com/en-ca). You can use this to control the Pioreactor. You can also view the status of the Pioreactor and view graphs of the data. To use a custom Pioreactor, click on the Custom tab.")
+
+            gr.Markdown("A demo video of the Pioreactor Control Panel is available [here](https://www.youtube.com/watch?v=Xox2XnA9cyI).")
             
         gr.Image("pioreactor.webp")