Bulma v9 website (#3249)

* Add Bulma v9

* Add vendor dependencies

* Fix native

* Fix sponsors

* Add style attribute

docs/_javascript/start.js

@@ -0,0 +1,35 @@
+document.addEventListener('DOMContentLoaded', () => {
+  // Utils
+
+  const tabs = getAll('.bd-tabs');
+
+  if (tabs && tabs.length > 0) {
+    tabs.forEach((tab) => {
+      const buttons = getAll('.bd-tabs-nav button', tab);
+      const items = getAll('.bd-tabs-item', tab);
+
+      buttons.forEach((button, index) => {
+        button.addEventListener('click', (event) => {
+          showTab(buttons, items, index);
+        });
+      });
+    });
+  }
+
+  function showTab(buttons, items, index) {
+    buttons.forEach((button) => {
+      button.classList.remove('bd-is-active');
+    });
+
+    items.forEach((item) => {
+      item.classList.remove('bd-is-active');
+    });
+
+    buttons[index].classList.add('bd-is-active');
+    items[index].classList.add('bd-is-active');
+  }
+
+  function getAll(selector, parent = document) {
+    return Array.prototype.slice.call(parent.querySelectorAll(selector), 0);
+  }
+});