fix(auth): add prod url for re-direct

frontend/src/config/auth.js

@@ -2,6 +2,6 @@ export const HF_CONFIG = {
   CLIENT_ID: "b78fb86a-a94f-4f18-b0de-c559486ff756",
   STORAGE_KEY: "hf_oauth",
   SCOPE: "openid profile",
-  PROD_URL: "",
+  PROD_URL: "https://huggingface.co/spaces/fr-gouv-coordination-ia/llm_leaderboard_fr",
   DEV_URL: "http://localhost:7860"
 };