Include external WebFont

• Product: Font Awesome Free
• Vendor: https://fontawesome.com/

page.includeCSSLibs {
    fontawesomeFree = https://use.fontawesome.com/releases/v5.5.0/css/all.css
    fontawesomeFree {
        external = 1
        disableCompression = 1
        excludeFromConcatenation = 1
    }
}