Hide/Filter Offline Node/User

[IamTaoChen]

Maybe we can filter the nodes and users, e.g. Online/Offline.

And for routes, we should hide the device if there is no routes

[GoodiesHQ]

Agreed on both! I wanted to hide those nodes with no routes in the first place, I can't remember why I didn't. I'll add this functionality to the dev branch and let you know when it is available so you can use the :dev tag on Dockerhub and test it out. Thanks!