Add Google Analytics

Author: cnlee1702

_includes/analytics.html

@@ -0,0 +1,10 @@
+<!--Global Site Tag (gtag.js) - Google Analytics -->
+<script async src="https://www.googletagmanager.com/gtag/js?id=UA-107131347-1"></script>
+<script>
+  window.dataLayer = window.dataLayer || [];
+  function gtag(){dataLayer.push(arguments)};
+  gtag('js', new Date());
+
+  gtag('config', 'UA-107131347-1');
+</script>
+

_layouts/default.html

@@ -16,6 +16,8 @@
     {% include footer.html %}
     {% include modals.html %}
     {% include js.html %}
-
+    {% if jekyll.environment == 'production' %}
+    {% include analytics.html %}
+    {% endif %}
     </body>
-</html>
+</html>