Add range of colors for at-a-glance info

[KeivaOG]

Has this issue been covered in the Wiki?

• [x] I have read the Wiki and my issue is not covered.

Is there an existing issue reported already?

• [x] I have searched the existing issues, it does not exist.

Describe the new feature you would like

It would be very helpful if we could choose colors to use for each sensor so that it's easier to see if something is "bad." For instance, if the temperature is above a certain threshold, or if storage drops below a certain threshold, it changes from green to yellow to red. A color picker would also be nice so we can choose our own colors.