Update app.py

app.py

@@ -73,11 +73,11 @@ for message in st.session_state.messages:
     if message['role'] == 'assistant':
         avatar_class = "assistant-avatar"
         message_class = "assistant-message"
-        avatar = './app/static/ai.png'
+        avatar = './static/AI.png'
     else:
         avatar_class = "user-avatar"
         message_class = "user-message"
-        avatar = './app/static/human.png'
+        avatar = './static/human.jpg'
     st.markdown(f"""
     <div class="{message_class}">
         <img src="{avatar}" class="{avatar_class}" />