LightningCard: Show total channel balance as a bar

[cstenglein]

Show some kind of progress bar how balanced the channels are in total.

E.g.

Local / remote 70k sat / 30k sat

<-------|--->

[escapedcat]

Thunderhub example:

Anyone knows any other examples?

[cstenglein]

I played around some months ago with an implementation, will look if I have the code

EDIT: can't find it anymore :/

[escapedcat]

At Alby we created a channel layout for a sideproject. This code might work. At least as a start.