Update multi-tenancy.md

remove the kiosk project from the page as it has been archived by its owner.

Author: raesene

content/en/docs/concepts/security/multi-tenancy.md

@@ -463,7 +463,6 @@ listed below.
 #### Multi-team tenancy
 
 * [Capsule](https://github.com/clastix/capsule)
-* [Kiosk](https://github.com/loft-sh/kiosk)
 
 #### Multi-customer tenancy
 
@@ -514,4 +513,4 @@ project provides an implementation of virtual control planes.
 #### Other implementations
 
 * [Kamaji](https://github.com/clastix/kamaji)
-* [vcluster](https://github.com/loft-sh/vcluster)
+* [vcluster](https://github.com/loft-sh/vcluster)