Add Umami Features

Author: Szymok

_includes/head.liquid

@@ -187,3 +187,10 @@
 {% if page.tikzjax %}
   <link defer rel="stylesheet" type="text/css" href="https://tikzjax.com/v1/fonts.css">
 {% endif %}
+
+{% if jekyll.environment == 'production' %}
+  <script async defer
+    data-website-id="70eace4c-383a-45d8-977d-0fb10ff9844a"
+    src="https://umami.skszymon.eu/script.js">
+  </script>
+{% endif %}