Temporarily remove Dex login support

This will be added back in later in this PR as part of proper generic OIDC support

util/config/oauth.py

@@ -349,22 +349,3 @@ class OIDCConfig(OAuthConfig):
     # Reload the key so that we can give a key *instance* to PyJWT to work around its weird parsing
     # issues.
     return load_der_public_key(rsa_key.key.exportKey('DER'), backend=default_backend())
-
-
-class DexOAuthConfig(OIDCConfig):
-  def service_name(self):
-    return 'Dex'
-
-  @property
-  def public_title(self):
-    return self.get_public_config()['OIDC_TITLE']
-
-  def get_public_config(self):
-    return {
-      'CLIENT_ID': self.client_id(),
-      'AUTHORIZE_ENDPOINT': self.authorize_endpoint(),
-
-      # TODO(jschorr): This should ideally come from the Dex side.
-      'OIDC_TITLE': 'Dex',
-      'OIDC_LOGO': 'https://tectonic.com/assets/ico/favicon-96x96.png'
-    }