Kind cleanup - Remove Romana

This doimain does not work and company appears to be defunct.

content/en/docs/concepts/cluster-administration/networking.md

@@ -225,10 +225,6 @@ stateful ACLs, load-balancers etc to build different virtual networking
 topologies.  The project has a specific Kubernetes plugin and documentation
 at [ovn-kubernetes](https://github.com/openvswitch/ovn-kubernetes).
 
-### Romana
-
-[Romana](https://romana.io) is an open source network and security automation solution that lets you deploy Kubernetes without an overlay network. Romana supports Kubernetes [Network Policy](/docs/concepts/services-networking/network-policies/) to provide isolation across network namespaces.
-
 ### Weave Net from Weaveworks
 
 [Weave Net](https://www.weave.works/products/weave-net/) is a