Is it possible to extend the Rancher web UI in a standard way (i.e. without having to fork the source tree)? I was hoping there was a way to add a visualization of some CRD resource instance by having an additional item on the left menu when you are looking at a cluster and when the item was selected maybe Rancher could create a windows and call another container (service) and render the visualization based on the HTLM/JS that is returned from the call? Any standard way to do something like this?