Add Matomo analytics tracking (#264)

* Initial plan

* Add Matomo tracking code to documentation

Co-authored-by: poshul <146827+poshul@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: poshul <146827+poshul@users.noreply.github.com>

Author: Copilot

_static/js/matomo.js

@@ -0,0 +1,12 @@
+// Matomo tracking code
+var _paq = window._paq = window._paq || [];
+/* tracker methods like "setCustomDimension" should be called before "trackPageView" */
+_paq.push(['trackPageView']);
+_paq.push(['enableLinkTracking']);
+(function() {
+  var u="https://openms.matomo.cloud/";
+  _paq.push(['setTrackerUrl', u+'matomo.php']);
+  _paq.push(['setSiteId', '2']);
+  var d=document, g=d.createElement('script'), s=d.getElementsByTagName('script')[0];
+  g.async=true; g.src='https://cdn.matomo.cloud/openms.matomo.cloud/matomo.js'; s.parentNode.insertBefore(g,s);
+})();

docs/conf.py

@@ -133,6 +133,7 @@
 ]
 
 html_js_files = [
+    'js/matomo.js',  # Matomo tracking code for openms.matomo.cloud
     'js/piwik.js',  # For tracking user statistics on openms-web.piwik.pro
     'js/gmc.min.js',  # GitHub Manyfaced Cards for showcasing GitHub repos (e.g. nf-core workflows)
 ]