[Bug] Web UI now configure with env variables instead of configmap #393
Description
To configure web ui, as shown in the document, we use web.config in the helm values.yaml, the config will be mount as a configmap to temporalio/ui pod.
Since web ui v2, the mounted configmap volume is removed, as in #300.
In web ui v2, configuration is provided with env variables, but the values.yaml and the documentation didn't reflect that.