Add failure strategy to README.md (#731)

See internal thread https://huggingface.slack.com/archives/C02136Y252P/p1706115793253869

README.md

@@ -8,6 +8,7 @@ pinned: false
 license: apache-2.0
 base_path: /chat
 app_port: 3000
+failure_strategy: rollback
 ---
 
 # Chat UI