Document the setup needed for syncing Che settings to devworkspace namespaces

= Synchronizing the {prod-shot} server settings to DevWorkspace namespaces The ability of {prod-short} server to pass its configuration for setting various preferences in a {prod-short} workspace Pod and user's namespace was also extended for DevWorkspaces. The `che-operator` controller watches: * OpenShift projects * Kubernetes namespaces This observation function, in which the `che-operator` controller watches OpenShift projects, adds the ability to synchronize the {prod-short} server settings to a user's workspace namespace. To do so, a namespace has to have an appropriate label that consists of a user UID: * `org.eclipse.che/workspace-namespace-owner-uid`. Workspace namespaces labeled with the user's UID are marked for settings synchronization. The UID value in: * OpenShift: the user's UID of the user object * Kubernetes: the user's UID is extracted from the OAuth token provided by the configured OIDC provider. .Use-case . Create a namespace and label it with `org.eclipse.che/workspace-namespace-owner-uid`. . Check that the {prod-short} server proxy settings were synchronized to that namespace in its ConfigMap and self-signed certificates were synchronized in a Kubernetes secret of the namespace.