Add % Value option

[nicufarmache]

Discussed in https://github.com/nicufarmache/lovelace-big-slider-card/discussions/2

^{Originally posted by **markus99** February 28, 2023} Any thought to add a % value (either after name or as 2nd line below?) Mushroom sliders aren't great, but what I'm using now and can show the value like this: 

[antonio1475]

I fully agree. It was the first thing I missed when testing this card (which btw is great and has a great potential - this type of slider was requested a lot in Mushroom)

I would also consider making the name bold, and the brightness in gray below (also bold) - based on Mushroom styling, which imho is great.

[nicufarmache]

published in release 1.0.8