Finalized Jupyterlab for the sprint

app/callbacks.py

+import os
 from datetime import datetime
 
 from dash import (
@@ -10,7 +11,7 @@ from dash.dependencies import (
     State
 )
 
-from llm_utils.client import ChatGPT
+from llm_utils.client import ChatGPT, get_openai_client
 
 
 def format_chat_messages(chat_history):
@@ -24,8 +25,15 @@ def format_chat_messages(chat_history):
 
 
 def register_callbacks(app: Dash):
-    
-    chat_gpt = ChatGPT(model="gpt4")
+    model="gpt4"
+    client = get_openai_client(
+        model=model,
+        config_path=os.environ.get("CONFIG_PATH")
+    )
+    chat_gpt = ChatGPT(
+        client=client,
+        model="gpt4"
+    )
     
     @app.callback(
         [Output('chat-container', 'children'),