Clusters dashboard

Totally work in progress, but at least applies now (after lying dormant for 3 months). Not sure if it even works, to be confirmed... I also need to do a massive rebase to make sure it looks like I know what I'm doing. Use at your own risk.


When picking nodes/clusters for deployment, I think we just say "clusters". But I think I'm with @jsuchome when it comes to the label for the navigation.