Having buttons (previously links) with the text "I agree 75%" is
confusing; people might believe they're saying they only partially agree
with the content. Besides, the results percentages is a different piece
of information which shouldn't be related to whether one person
agrees/disagrees with the content.
This problem might be solved for people using screen readers since we
added the aria-label attribute. However, for sighted keyboard users, the
percentage was being outlined on focus as part of the button, which
might be confusing.
We were using the same code to render links to agree and disagree, so we
can extract a new component for this code.
We're also adding component tests to make it easier to test whether
we're breaking anything while refactoring, although the code is probably
already covered by system tests.
Since the votes mixin was only used in one place, we're removing it and
moving most of its code to a new CSS file for the shared component.
