Add support for Cloudflare analytics (#798)

_includes/cloudflare_analytics.html

@@ -0,0 +1,8 @@
+{% if site.cloudflare_analytics %}
+<!-- Cloudflare Web Analytics -->
+<script defer
+    src='https://static.cloudflareinsights.com/beacon.min.js'
+    data-cf-beacon='{"token": "{{ site.cloudflare_analytics}}"}'>
+</script>
+<!-- End Cloudflare Web Analytics -->
+{% endif %}

_includes/head.html

@@ -44,6 +44,7 @@
   {% include gtag.html %}
   {% include gtm_head.html %}
   {% include google_analytics.html %}
+  {% include cloudflare_analytics.html %}
 
   {% if layout.common-ext-css %}
     {% for css in layout.common-ext-css %}