Introduce breadcrumbs instead of back-button

[RoboMagus]

I think this could be a very good improvement that also mitigates this other WTH:

WTH does the back button often not do what I think it will do?

The back button often doesn’t work as you think it will. It seems to be mapped to the browser history back and not what the user often things is “back.” This has been fixed in some places (like fix back button in hassio addons by bramkragten · Pull Request #14161 · home-assistant/frontend · GitHub), but not everywhere. Closed panel means broken history I think the biggest gotcha is when you click on an item in the UI that opens a panel. Everything seems to get out of whack once a modal panel po…