chore: Update API key retrieval method

Update the method for retrieving the API key by using the `os.getenv` function instead of `st.secrets`.

nemo.py

@@ -4,13 +4,14 @@ import re
 from collections import namedtuple
 from sentence_transformers import SentenceTransformer, util
 import streamlit as st
+import os
 
 Level = namedtuple("Level", ["name", "description", "hint", "phrase"])
 
 
 class EnigmaEscape:
     API_ENDPOINT = "https://api.endpoints.anyscale.com/v1/chat/completions"
-    API_KEY = st.secrets["anyscale_api"]
+    API_KEY = os.getenv("anyscale_api")
     forbids = [
         "replace",
         "swap",