Update cards to be buttons to allow for keyboard navigation #2
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Due to everything in the cards being divs, being able to open the cards using basic keyboard navigation isn't possible. This pull request changes interactive components into buttons, adds aria-labels to each button so screen readers will read out which card they are over, and changes the event listener to be on click so it can be triggered with a keyboard "enter" press. It also (hopefully) removes the default styling from the buttons so it doesn't look any different.
To manually check this, firstly you should be able to click/mouseover like before. Secondly, you should be able to "tab" between each card and press "enter" to open/close them.
Note that I really don't know what I'm doing with Svelte, so if I've introduced any anti-patterns then I'm happy to change them. Also, I haven't checked this change in all browsers but it seems to work at least in Chrome and Firefox on macOS.