Added support for Google Analytics

Since GitHub does not even collect simple statistics, this is the best
option we have.

Author: Pseudomanifold

config.toml

@@ -6,6 +6,7 @@ enableGitInfo = true
 
 [params]
   description = "Website of the AIDOS Lab, an international lab of researchers interested in geometry, topology, and machine learning."
+  googleTagID = "G-Z7H79RP4BR"
 
 ignoreFiles = ['publications.md$']
 

themes/brevis/layouts/partials/head.html

@@ -23,4 +23,16 @@
   <link rel="preload" as="style" href="{{ relURL "css/style.css" }}">
   <link rel="stylesheet" href="{{ relURL "css/style.css" }}">
 
+  {{ with .Site.Params.googleTagID }}
+  <!-- Google tag (gtag.js) -->
+  <script async src="https://www.googletagmanager.com/gtag/js?id={{ . }}"></script>
+  <script>
+    window.dataLayer = window.dataLayer || [];
+    function gtag(){dataLayer.push(arguments);}
+    gtag('js', new Date());
+
+    gtag('config', '{{ . }}');
+  </script>
+  {{ end }}
+
 </head>