upgrade to use @fortawesome/react-fontawesome

The benefits of an SVG-based icon system are vast and varied, but a few of them include:

smaller bundle size
more explicit dependencies
no reliance on tricky "magic number" font-size sizing
composable just like any other react element
more features like two-tone colored icons and others
this is what font-awesome themselves are using for all projects, so it's the "happiest path" when it comes to maintenance

weaveworks / ui-components