Add academic metadata: citation_date

Author: matthewsmawfield

site/index.html

@@ -115,12 +115,12 @@
     <link rel="dns-prefetch" href="https://cdn.jsdelivr.net">
 
     <!-- Google tag (gtag.js) -->
-    <script async src="https://www.googletagmanager.com/gtag/js?id=G-49MPEVQZG3"></script>
+    <script async src="https://www.googletagmanager.com/gtag/js?id=G-P7NZYHS2FW"></script>
     <script>
       window.dataLayer = window.dataLayer || [];
       function gtag(){dataLayer.push(arguments);}
       gtag('js', new Date());
-      gtag('config', 'G-49MPEVQZG3', { 'anonymize_ip': true });
+      gtag('config', 'G-P7NZYHS2FW', { 'anonymize_ip': true });
     </script>
 
     <!-- Structured Data / JSON-LD -->