ESI Datasource Setting is misleading.
As of January 2020, the singularity datasource has been removed. Our documentation should be updated to reflect this.
I would suggest that we remove this setting from the Settings
section of the docs as it would only be needed if a user is trying to use the serenity datasource, which requires extra configuration of SSO Url and ESI URL. (We could add a section on configuring for serenity)