blog.grink.tech/custom-theme/templates/include/ga.html

<script>
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    i[r] = i[r] || function() {
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    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', '{{ GOOGLE_ANALYTICS }}', 'auto');
ga('send', 'pageview');
</script>