feat: use env vars to store hf token

app.py

@@ -2,13 +2,14 @@ import streamlit as st
 import yaml
 import requests
 import re
+import os
 from pdfParser import get_pdf_text
 
-
-try:
-    api_key = st.secrets.hf_credentials.hf_api
-except:
-    api_key = st.secrets.hf_api
+# Get HuggingFace API key
+api_key_name = "HUGGINGFACE_HUB_TOKEN"
+api_key = os.getenv(api_key_name)
+if api_key is None:
+    st.error(f"Failed to read `{api_key_name}`. Ensure the token is correctly located")
 
 with open("config/model_config.yml", "r") as file:
     model_config = yaml.safe_load(file)