Font Awesome CDNJS no funciona
<link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.13.0/css/all.css">
Smoggy Stoat
<link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.13.0/css/all.css">
<link href="http://maxcdn.bootstrapcdn.com/font-awesome/4.1.0/css/font-awesome.min.css" rel="stylesheet">