Add documentation

frontend/documentation/js/tabs.js

@@ -0,0 +1,21 @@
+document.addEventListener('DOMContentLoaded', function() {
+    var tabs = document.getElementsByClassName('nav-tabs'),
+        updateAddress = function(e) {
+            if(history.pushState && e.target.dataset.link) {
+                history.pushState(null, null, '#' + e.target.dataset.link);
+            }
+        };
+    if (tabs.length > 0) {
+        tabs = tabs[0].querySelectorAll('li');
+        for (var i = 0; i < tabs.length; i++) {
+            tabs[i].addEventListener('click', updateAddress);
+            var linkTag = tabs[i].querySelector('a');
+            if (location.hash !== '') {
+                var currentHash = location.hash.substr(1);
+                if (currentHash === linkTag.dataset.link) {
+                    linkTag.click();
+                }
+            }
+        }
+    }
+});