Removed link for Cabin mobile app (#5231)

Signed-off-by: Jacob Silva <jacob.silva0123@gmail.com>

docs/related.md

@@ -89,7 +89,6 @@ Tools layered on top of Helm or Tiller.
 
 Platforms, distributions, and services that include Helm support.
 
-- [Cabin](http://www.skippbox.com/cabin/) - Mobile App for Managing Kubernetes
 - [Fabric8](https://fabric8.io) - Integrated development platform for Kubernetes
 - [Jenkins X](http://jenkins-x.io/) - open source automated CI/CD for Kubernetes which uses Helm for [promoting](http://jenkins-x.io/about/features/#promotion) applications through [environments via GitOps](http://jenkins-x.io/about/features/#environments)
 - [Kubernetic](https://kubernetic.com/) - Kubernetes Desktop Client