Update app.py

app.py

@@ -55,7 +55,8 @@ with gr.Blocks(css=custom_css) as demo:
         [],
         elem_id="chatbot",
         bubble_full_width=False,
-        avatar_images=(None, "https://i.postimg.cc/WzyPM3Tf/a-cartoon-chatbot-breaking-free-from-a-cage-movie-kkx4x9-D9-Qmq-JCq-QFLZp-R5w-1t-MCCDr-RTavx-Pd-Z4a-X6-TQ.png")
+        avatar_link = os.getenv('avatar_link')
+        avatar_images=(None, avatar_link)
     )
     msg = gr.Textbox(
         show_label=False,