A documentation section has been added to the site.

app/application/resources/site/js/_choose-documentation-version.js

@@ -0,0 +1,8 @@
+let blockDocumentationVersion = document.querySelector('#documentation-version');
+blockDocumentationVersion.querySelector('.documentation-version__button').addEventListener('click', (e) => {
+    if (blockDocumentationVersion.classList.contains('active')) {
+        blockDocumentationVersion.classList.remove('active');
+    } else {
+        blockDocumentationVersion.classList.add('active');
+    }
+});

app/application/resources/site/js/app.js

@@ -1,2 +1,3 @@
 import './_menu.js';
 import './_choose-language.js';
+import './_choose-documentation-version.js';