Improve Initial FontAwesome Config; Free vs. Pro

[jeremy-farrance]

We already have a switch to enable FontAwesome usage. Since the pattern is so specific, it would be nice to also have a switch that specifies fa Free vs. Pro and gets the right thing in place for each.

Maybe even ... although the Pro isTrue might be unneeded, just including the KITID should be enough to switch and use that pattern.

vendors: {
    bootstrap: isTrue(VENDOR_BOOTSTRAP),
    flickity: isTrue(VENDOR_FLICKITY),
    fontAwesome: isTrue(VENDOR_FONT_AWESOME),
    fontAwesomePro: isTrue(VENDOR_FA_PRO),
    fontAwesomeKitId: VENDOR_FA_KITID
  },