Swipeable cards a11y

The cards present an interesting challenge because there isn't a great analog for them in existing browser semantics.

Some things I was considering...

Can the cards be made out of a ul and li instead of divs? That way the screen reader would announce how many cards are in the list. Alternatively I think you could give the parent div a role of `list` and the children a role of `listitem`.

Can the cards be made focusable. Maybe adding a hint with an aria-label that they can be deleted either by swiping or pressing the esc key.