Include non-text contrast option

[Paul Grenier]

For example, if someone is creating an icon button, the non-text contrast must be 3:1. https://www.w3.org/WAI/WCAG21/Understanding/non-text-contrast.html

[Harris Schneiderman]

👍 great idea! We've actually already planned on doing something like this...iirc @awpearlm was going to throw together an idea on how we will support this