[keycloak-dev] Remove realm json at "/auth/realms/<realm name>"

I propose we remove the realm json returned at "/auth/realms/<realm name>" and just return an empty page * It can end-up being visible to end-users - we should rather have a realm welcome page / SSO landing page here * It's not used by anything AFAIK * From time to time people complain about it ( https://issues.jboss.org/browse/KEYCLOAK-5279 for instance, there's more similar issues reported)