refactor: remove embedded bilibili video iframe from app

The embedded video was removed to simplify the UI and reduce external dependencies. The functionality wasn't core to the application's purpose.

app.py

@@ -98,10 +98,4 @@ if __name__ == "__main__":
             cache_examples=False,
         )
 
-        gr.HTML(
-            """
-            <iframe src="//player.bilibili.com/player.html?bvid=BV14krgYJE4B&autoplay=0" scrolling="no" border="0" frameborder="no" framespacing="0" allowfullscreen="true" width="100%" style="aspect-ratio: 16 / 9;"></iframe>
-            """
-        )
-
     demo.launch()