Add Matomo tracking code

app/views/layouts/_matomo.html.haml

@@ -0,0 +1,15 @@
+:javascript
+  var _paq = _paq || [];
+  /* tracker methods like "setCustomDimension" should be called before "trackPageView" */
+  _paq.push(["setCookieDomain", "*.www.demarches-simplifiees.fr"]);
+  _paq.push(["setDomains", ["*.www.demarches-simplifiees.fr"]]);
+  _paq.push(["setDoNotTrack", true]);
+  _paq.push(['trackPageView']);
+  _paq.push(['enableLinkTracking']);
+  (function() {
+    var u="//stats.data.gouv.fr/";
+    _paq.push(['setTrackerUrl', u+'piwik.php']);
+    _paq.push(['setSiteId', '73']);
+    var d=document, g=d.createElement('script'), s=d.getElementsByTagName('script')[0];
+    g.type='text/javascript'; g.async=true; g.defer=true; g.src=u+'piwik.js'; s.parentNode.insertBefore(g,s);
+  })();

app/views/layouts/application.html.haml

@@ -16,10 +16,13 @@
     = javascript_include_tag 'application', defer: true, 'data-turbolinks-track': 'reload'
     = csrf_meta_tags
 
+    = render partial: "layouts/matomo"
+
     :javascript
       DATA = [{
         sentry: #{raw(sentry_config)}
       }];
+
   %body{ class: browser.platform.ios? ? 'ios' : nil }
     = render partial: 'layouts/outdated_browser_banner'
     = render partial: 'layouts/pre_maintenance'

app/views/layouts/new_application.html.haml

@@ -21,10 +21,14 @@
     - if Rails.env.development?
       = stylesheet_link_tag :xray
 
+    - if !current_user
+      = render partial: "layouts/matomo"
+
     :javascript
       DATA = [{
         sentry: #{raw(sentry_config)}
       }];
+
   %body{ class: browser.platform.ios? ? 'ios' : nil }
     .page-wrapper
       = render partial: "layouts/outdated_browser_banner"