Added visitor tracking code to Pages

Author: petrsocha

docs/html/index.html

@@ -130,4 +130,15 @@ <h1><a class="anchor" id="contact"></a>
 </a> 1.8.14
 </small></address>
 </body>
+
+<!-- Global site tag (gtag.js) - Google Analytics -->
+<script async src="https://www.googletagmanager.com/gtag/js?id=UA-370649-21"></script>
+<script>
+  window.dataLayer = window.dataLayer || [];
+  function gtag(){dataLayer.push(arguments);}
+  gtag('js', new Date());
+
+  gtag('config', 'UA-370649-21');
+</script>
+
 </html>

docs/index.html

@@ -105,4 +105,15 @@ <h2>Contact</h2>
     </main>
 
 </body>
+
+<!-- Global site tag (gtag.js) - Google Analytics -->
+<script async src="https://www.googletagmanager.com/gtag/js?id=UA-370649-21"></script>
+<script>
+  window.dataLayer = window.dataLayer || [];
+  function gtag(){dataLayer.push(arguments);}
+  gtag('js', new Date());
+
+  gtag('config', 'UA-370649-21');
+</script>
+
 </html>

docs/userguide/index.html

@@ -1459,4 +1459,15 @@ <h2 id="contact">18. Contact</h2>
     </main>
 
 </body>
+
+<!-- Global site tag (gtag.js) - Google Analytics -->
+<script async src="https://www.googletagmanager.com/gtag/js?id=UA-370649-21"></script>
+<script>
+  window.dataLayer = window.dataLayer || [];
+  function gtag(){dataLayer.push(arguments);}
+  gtag('js', new Date());
+
+  gtag('config', 'UA-370649-21');
+</script>
+
 </html>