Document skip step for demo users/groups and fix changelog

docs/ocis/deployment/_index.md

@@ -45,6 +45,9 @@ You can change it by setting the `STORAGE_TRANSFER_SECRET` environment variable
 
 {{< hint info >}}
 Before deleting the demo users mentioned below, you must create a new account for yourself and assign it to the administrator role.
+
+To skip the generation of demo users in the first place, run the inital setup step with an additional environment variable.
+`ACCOUNTS_DEMO_USERS_AND_GROUPS=false ./bin/ocis server` generates only the admin, and one user for IDP and Reva respectively.
 {{< /hint >}}
 
 oCIS ships with a few demo users besides the system users: