fix(v2): examples should use Node 14 by default on CodeSandbox + regen with alpha72 (#4574)

* codesandbox: use node 14 by default

* Regenerate examples

* Add example json files to prettierrignore

examples/classic/docusaurus.config.js

@@ -38,13 +38,9 @@ module.exports = {
           title: 'Docs',
           items: [
             {
-              label: 'Style Guide',
+              label: 'Getting Started',
               to: 'docs/',
             },
-            {
-              label: 'Second Doc',
-              to: 'docs/doc2/',
-            },
           ],
         },
         {