Adds matomo analytics to docs

   This uses the recommended way to extend the template that furo uses.

Author: skrawcz

docs/_templates/page.html

@@ -0,0 +1,23 @@
+{% extends "!page.html" %}
+
+{% block extrahead %}
+{{ super() }}
+<!-- Matomo -->
+<script>
+  var _paq = window._paq = window._paq || [];
+  /* tracker methods like "setCustomDimension" should be called before "trackPageView" */
+  _paq.push(["setDoNotTrack", true]);
+  _paq.push(["disableCookies"]);
+  _paq.push(['trackPageView']);
+  _paq.push(['enableLinkTracking']);
+  (function() {
+    var u="https://analytics.apache.org/";
+    _paq.push(['setTrackerUrl', u+'matomo.php']);
+    _paq.push(['setSiteId', '87']);
+    var d=document, g=d.createElement('script'),
+s=d.getElementsByTagName('script')[0];
+    g.async=true; g.src=u+'matomo.js'; s.parentNode.insertBefore(g,s);
+  })();
+</script>
+<!-- End Matomo Code -->
+{% endblock %}