external.html

<script type="text/javascript" src="//code.jquery.com/jquery-1.11.3.min.js"></script>

<script type="text/javascript" src="/js/main.js"></script>

{% if site.ga.id %}
<script>
    (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
        (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
        m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
    })(window,document,'script','//www.google-analytics.com/analytics.js','ga');
    ga('create', '{{site.ga.id}}', '{{site.ga.host}}');
    ga('send', 'pageview');
</script>
{% endif %}