chore(v2): update examples to use alpha73 (#4631)

* regenerate examples on alpha73

* fix init template typo + add missing files

examples/classic/sidebars.js

@@ -1,16 +1,26 @@
+/**
+ * Creating a sidebar enables you to:
+ - create an ordered group of docs
+ - render a sidebar for each doc of that group
+ - provide next/previous navigation
+
+ The sidebars can be generated from the filesystem, or explicitly defined here.
+
+ Create as many sidebars as you want.
+ */
+
 module.exports = {
-  docs: [
+  // By default, Docusaurus generates a sidebar from the docs folder structure
+  tutorialSidebar: [{type: 'autogenerated', dirName: '.'}],
+
+  // But you can create a sidebar manually
+  /*
+  tutorialSidebar: [
     {
       type: 'category',
-      label: 'Docusaurus Tutorial',
-      items: [
-        'getting-started',
-        'create-a-page',
-        'create-a-document',
-        'create-a-blog-post',
-        'markdown-features',
-        'thank-you',
-      ],
+      label: 'Tutorial',
+      items: ['hello'],
     },
   ],
+   */
 };