react-icons - generate static SVGs

[mcoker]

The brand icons are in @patternfly/react-icons now via #12143 and can be seen on https://pf-react-staging.patternfly.org/icons/

We'll need an easy way for core to access at least some of these icons. @kmcfaul floated the idea of react-icons creating static SVGs, and that seems useful for core and other non-react users.