We were using list items with the checkbox role. This is probably
confusing since list items have a listitem role, and so we were
basically using a list with no listitem.
We could add a `<span role="checkbox">` tag inside the list item, but
using real checkboxes is probably easier. We're also adding a test to
verify the checkboxes native behavior is compatible with our code.
Note we're using the "enter" key to toggle the "checked" status of the
SDG. This is probably not intuitive for screen reader users who might
try to submit the form using the "enter" key after selecting a goal.
However, the alternative would be even less intuitive for sighted
keyboard users, since for them these icons look like links or buttons
and they would accidentally submit the form when trying to select a
goal.
Since we haven't come up with a better interface yet, for now we're
following the principle of least damage; we consider submitting the form
against a user's will is less annoying than forcing users to move to a
different field before being able to submit the form.
Also note we can't write `check` in the tests because Capybara will try
to click the checkbox, which is hidden by the image in the label.
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