clean up privategpt example

examples/privategpt/privateGPT.py

@@ -1,5 +1,4 @@
 #!/usr/bin/env python3
-from dotenv import load_dotenv
 from langchain.chains import RetrievalQA
 from langchain.embeddings import HuggingFaceEmbeddings
 from langchain.callbacks.streaming_stdout import StreamingStdOutCallbackHandler
@@ -9,8 +8,6 @@ import os
 import argparse
 import time
 
-load_dotenv()
-
 model = os.environ.get("MODEL", "llama2-uncensored")
 embeddings_model_name = os.environ.get("EMBEDDINGS_MODEL_NAME", "all-MiniLM-L6-v2")
 persist_directory = os.environ.get("PERSIST_DIRECTORY", "db")