Add Google Analytics (#118)

_includes/core/google-analytics.html

@@ -0,0 +1,14 @@
+<!-- Google tag (gtag.js) -->
+<script
+  async
+  src="https://www.googletagmanager.com/gtag/js?id=G-N6PDRF81KR"
+></script>
+<script>
+  window.dataLayer = window.dataLayer || [];
+  function gtag() {
+    dataLayer.push(arguments);
+  }
+  gtag("js", new Date());
+
+  gtag("config", "G-N6PDRF81KR");
+</script>

_layouts/default.html

@@ -2,8 +2,8 @@
 layout: base
 ---
 
-{% include core/header.html %} {% include components/hero-text.html
-heading=page.title text=page.description %}
+{% include core/header.html %} {% include core/google-analytics.html %} {%
+include components/hero-text.html heading=page.title text=page.description %}
 <div class="grid-container">{{ content }}</div>
 
 {% include core/footer.html %}

_layouts/hero-image.html

@@ -2,7 +2,7 @@
 layout: base
 ---
 
-{% include core/header.html %} {% include components/hero-image.html
-content=page.description %}
+{% include core/header.html %} {% include core/google-analytics.html %} {%
+include components/hero-image.html content=page.description %}
 <div class="grid-container">{{ content }}</div>
 {% include core/footer.html %}