update nav iapi initialization

app.py

@@ -151,7 +151,7 @@ def generate_synthetic_records(api_key, chunks_dict, num_records):
 
     gretel = Gretel(api_key=api_key, validate=True, clear=True)
 
-    navigator = gretel.factories.initialize_inference_api("navigator")
+    navigator = gretel.factories.initialize_navigator_api("tabular")
 
     INTRO_PROMPT = "From the source text below, create a dataset with the following columns:\n"
     COLUMN_DETAILS = (