Split the energy dashboard into energy and devices

[balloob]

The energy dashboard started quite simple, with an overview of energy and a few gauge cards to show different insights on how energy was used.

We've added devices to this and this has made the page quite long. I think we've gotten to a point that we should consider splitting the page into 2 views. One for overview and one for devices.

Once we have this split, it would also open the door for other tabs (power anyone?)