Fix to demo instance

modules/nav_about.py

@@ -46,7 +46,7 @@ def app():
         This mode provides free access to a deployed model managed by the ZySec team, 
         subject to availability. It's a great choice for trying out ZySec without any setup.
         """)
-        remote_model_uri = st.text_input("Remote Model Base URL Endpoint",value=app_constants.ZYSEC_DEMO, key="remote_model_uri",disabled=True)
+        remote_model_uri = st.text_input("Remote Model Base URL Endpoint",value="DEMO INSTANCE", key="remote_model_uri",disabled=True)
         st.error("Disabled changes here but you can play with your own deployment")
 
     elif server_mode == "OpenAI":