Advertise from backend whether we are in telepresence mode

backend/areas/__init__.py

@@ -18,6 +18,7 @@ def api_environment():
     environment = {
         "HYDRA_PUBLIC_URL": HYDRA_PUBLIC_URL,
         "KRATOS_PUBLIC_URL": KRATOS_PUBLIC_URL,
+        "TELEPRESENCE": TELEPRESENCE,
     }
     return jsonify(environment)