Hopefully improved documentation around initial admin account creation.

docs/compose/setup.rst

@@ -96,7 +96,13 @@ You may now start Mailu. Move the to the Mailu directory and run:
 
   docker-compose up -d
 
-Finally, you must create the initial admin user account:
+Finally, you need an admin user account. 
+
+You can have the system create it automatically:
+use the environment variables ``INITIAL_ACCOUNT*`` as described in :ref:`admin_account`
+You should set ``INITIAL_ADMIN_MODE`` also to either ``update`` or ``ifmissing``. Leaving it with the default value could cause errors when restarting the system.  
+
+Else, if you don't go with the automatic way, you need to manually create the admin account now:
 
 .. code-block:: bash