chore: regenerate beta.6 examples + fix regen script (#5484)

* update examples script

* rename ext

* typo

* update examples

* fix script to update starters

* update examples

* add --allow-empty so that script does not fail if nothing changed

* fix lint

examples/bootstrap/docs/intro.md

@@ -0,0 +1,35 @@
+---
+sidebar_position: 1
+---
+
+# Tutorial Intro
+
+Let's discover **Docusaurus in less than 5 minutes**.
+
+## Getting Started
+
+Get started by **creating a new site**.
+
+Or **try Docusaurus immediately** with **[docusaurus.new](https://docusaurus.new)**.
+
+## Generate a new site
+
+Generate a new Docusaurus site using the **classic template**:
+
+```shell
+npx @docusaurus/init@latest init my-website classic
+```
+
+## Start your site
+
+Run the development server:
+
+```shell
+cd my-website
+
+npx docusaurus start
+```
+
+Your site starts at `http://localhost:3000`.
+
+Open `docs/intro.md` and edit some lines: the site **reloads automatically** and display your changes.