Style readonly attribute (not read-only)

[dancormier]

Addresses: https://github.com/StackExchange/Stacks/issues/620

The attribute to target is readonly. It can also be targeted as a pseudo-class in the form of :read-only, which is what I'd guess caused the confusion here.

The <select /> element

This targets a readonly attribute on <select /> elements, though that element does not support it. See: https://developer.mozilla.org/en-US/docs/Web/HTML/Element/select#attributes

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[aaronshekey]

I think this actually needs some more thought than just looking like a disabled input. I'll add this to a list of items needing designs.