missing documentation for redis.enabled

it's just a simple switch, but we want to have it documented for completeness.

README.md

@@ -54,6 +54,7 @@ It is possible to horizontally scale the UI Middleware, as more clients are fetc
 | `port`          | Exposed port                    | `"8080"` |
 | `cacheTTL`      | Vite manifest caching time      | `30000`  |
 | `logLevel`      | Pino log level                  | `"info"` |
+| `redis.enabled` | Global switch Redis integration |  false   |
 | `redis.host`    | Redis host                      |          |
 | `redis.port`    | Redis port (optional)           | `6379`   |
 | `redis.db`      | Redis DB, e.g. `"1"` (optional) | null     |