add preview

app.py

@@ -133,11 +133,7 @@ with gr.Blocks(
         fn=do_ocr,
         inputs=[input_type, url_input],
         outputs=[cleaned_output, url_input]
-    )
-
-demo = gr.Interface(do_ocr,
-                    inputs=[input_type, url_input],
-                    outputs=[cleaned_output, url_input])    
+    )  
 
 if __name__ == "__main__":
     demo.launch()