chore: update sample settings

#195

steering/sample_settings.py

-# sample settings for steering
+# Advanced settings for Steering
+# Go to https://docs.aura.radio to learn how to configure LDAP.
 
-from .settings import *  # noqa
-
-ADMINS = [("Ernesto", "ernesto@helsinki.at")]
-MANAGERS = ADMINS
-
-TIME_ZONE = "America/La_Paz"
+# import the base settings
+from steering.settings import *  # noqa
 
+# Import classes, functions, etc.
+from django_auth_ldap.config import GroupOfNamesType
+# and use them to extend or overwrite settings
+AUTH_LDAP_GROUP_TYPE = GroupOfNamesType(name_attr="cn")
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