Created by: pat270
…tion-focus-outline` so we can unset it via Sass and don't have to re-implement browser defaults
Previous to https://github.com/twbs/bootstrap/issues/24838, using .page-link with an anchor tag didn't apply a focus outline when clicked with mouse. This lets those that don't want the focus outline on click unset it via Sass.
Demo: http://getbootstrap.com/docs/4.0/components/pagination/