Fix FontAwesome script

ref #1922

Author: mmistakes

_includes/scripts.html

@@ -9,7 +9,7 @@
   {% endfor %}
 {% else %}
   <script src="{{ '/assets/js/main.min.js' | relative_url }}"></script>
-  <script src="https://use.fontawesome.com/releases/v5.5.0/css/all.css" integrity="sha384-B4dIYHKNBt8Bc12p+WXckhzcICo0wtJAoU8YZTY5qE0Id1GSseTk6S+L3BlXeVIU" crossorigin="anonymous"></script>
+  <script defer src="https://use.fontawesome.com/releases/v5.5.0/js/all.js" integrity="sha384-GqVMZRt5Gn7tB9D9q7ONtcp4gtHIUEW/yG7h98J7IpE3kpi+srfFyyB/04OV6pG0" crossorigin="anonymous"></script>
 {% endif %}
 
 {% if site.search == true or page.layout == "search" %}