Add fontawesome handle

[olefredrik]

No description provided.

[linuxbastard]

Minor wording issue:
Enqueue FontAwesome from CDN. Uncomment the line below if you don't need FontAwesome.

It should either be:

// Enqueue FontAwesome from CDN. Uncomment the line below if you need FontAwesome.
//wp_enqueue_script( 'fontawesome', 'https://use.fontawesome.com/5016a31c8c.js', array(), '4.7.0', true );

OR

// Enqueue FontAwesome from CDN. Comment out the line below if you don't need FontAwesome.
wp_enqueue_script( 'fontawesome', 'https://use.fontawesome.com/5016a31c8c.js', array(), '4.7.0', true );

I of course prefer not to load anything until we need it, so the first one works for me.

[olefredrik]

@linuxbastard : I agree. If you care to make a pull request for the first one, I'll merge it into master.