Add privacy-friendly analytics integration using Plausible

Author: tomaarsen

docs/_templates/layout.html

@@ -0,0 +1,9 @@
+{% extends "!layout.html" %}
+{% block extrahead %}
+<!-- Privacy-friendly analytics by Plausible -->
+<script async src="https://plausible.io/js/pa-B9Apen_9cO_gfwxvmnY5y.js"></script>
+<script>
+    window.plausible=window.plausible||function(){(plausible.q=plausible.q||[]).push(arguments)},plausible.init=plausible.init||function(i){plausible.o=i||{}};
+    plausible.init()
+</script>
+{% endblock %}