Avoid using onclick attribute

Moving to feature, I'm not going to kill the onclick attribute because that's a BC break, will add a new option underneath where you can toggle to either use onlick or js.

Needs work because it doesn't apply anymore either.

Neither js nor onclick are accessible, so this presents a significant access barrier.

Why can't an anchor tag ie. <a> be an option?

I have been referencing the Block link cards docs from W3 design system for this sort of thing. The approach is described in the Block Links: The Search for a Perfect Solution CSS tricks article.

But I'm not exactly sure how we would control that approach (Method 4 in the article) through the UI. Maybe we could assume the first link is the main link? (That's what I have been doing :shrug:)