Is your feature request related to a problem? Please describe.
I don't think Theme UI should be opinionated on which SVGs should be used for the Radio & CheckBox components
Describe the solution you'd like
Probably an additional prop called customIcon maybe... based on which we could conditionally render the passed SVG icon otherwise we use the default icons?
**Describe alter
Really love this library, especially all the accessibility considerations built in! One thing I've noticed in implementing it though is an error from accessibility validators for a missing aria-valuenow property on both the Color and Hue sliders.
I had an explore of the MDN docs for the two properties
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