Remove OIDC testing Page
The OIDC testing page is useful for developers that want to debug data from Hydra, because you easily get an insight in the OIDC data that is available. As such we might want to keep this functionality when the environment runs in "dev" mode, but it is useless to non-developer users, so this page should not be visible for end-users (and also not for admin users)
Edited by Maarten de Waard