Add CS2-SimpleAdmin documentation site

Introduces a new documentation site for CS2-SimpleAdmin using Docusaurus, including developer API references, tutorials, user guides, and module documentation. Removes the CleanModule example and updates FunCommands and ExampleModule. Also updates main plugin and API files to support new documentation and module structure.

CS2-SimpleAdmin-docs/docs/tutorial-basics/create-a-page.md

@@ -0,0 +1,43 @@
+---
+sidebar_position: 1
+---
+
+# Create a Page
+
+Add **Markdown or React** files to `src/pages` to create a **standalone page**:
+
+- `src/pages/index.js` → `localhost:3000/`
+- `src/pages/foo.md` → `localhost:3000/foo`
+- `src/pages/foo/bar.js` → `localhost:3000/foo/bar`
+
+## Create your first React Page
+
+Create a file at `src/pages/my-react-page.js`:
+
+```jsx title="src/pages/my-react-page.js"
+import React from 'react';
+import Layout from '@theme/Layout';
+
+export default function MyReactPage() {
+  return (
+    <Layout>
+      <h1>My React page</h1>
+      <p>This is a React page</p>
+    </Layout>
+  );
+}
+```
+
+A new page is now available at [http://localhost:3000/my-react-page](http://localhost:3000/my-react-page).
+
+## Create your first Markdown Page
+
+Create a file at `src/pages/my-markdown-page.md`:
+
+```mdx title="src/pages/my-markdown-page.md"
+# My Markdown page
+
+This is a Markdown page
+```
+
+A new page is now available at [http://localhost:3000/my-markdown-page](http://localhost:3000/my-markdown-page).