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/src/components/HomepageFeatures/index.js

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+import clsx from 'clsx';
+import Heading from '@theme/Heading';
+import styles from './styles.module.css';
+
+const FeatureList = [
+  {
+    title: 'Comprehensive Admin Tools',
+    img: require('@site/static/img/index_1.png').default,
+    description: (
+      <>
+        Full suite of admin commands for managing players, bans, mutes, warnings,
+        and server settings. Everything you need to moderate your CS2 server.
+      </>
+    ),
+  },
+  {
+    title: 'Multi-Server Support',
+    img: require('@site/static/img/index_2.png').default,
+    description: (
+      <>
+        Manage multiple servers with synchronized admin permissions and penalties.
+        Share bans, mutes, and admin groups across your entire server network.
+      </>
+    ),
+  },
+  {
+    title: 'Extensible API',
+    img: require('@site/static/img/index_3.png').default,
+    description: (
+      <>
+        Build custom modules using the public API. Create your own commands,
+        menus, and integrate with CS2-SimpleAdmin's permission and penalty systems.
+      </>
+    ),
+  },
+];
+
+function Feature({img, title, description}) {
+  return (
+    <div className={clsx('col col--4')}>
+      <div className="text--center">
+        <img src={img} className={styles.featureSvg} alt={title} />
+      </div>
+      <div className="text--center padding-horiz--md">
+        <Heading as="h3">{title}</Heading>
+        <p>{description}</p>
+      </div>
+    </div>
+  );
+}
+
+export default function HomepageFeatures() {
+  return (
+    <section className={styles.features}>
+      <div className="container">
+        <div className="row">
+          {FeatureList.map((props, idx) => (
+            <Feature key={idx} {...props} />
+          ))}
+        </div>
+      </div>
+    </section>
+  );
+}

CS2-SimpleAdmin-docs/src/components/HomepageFeatures/styles.module.css

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+.features {
+  display: flex;
+  align-items: center;
+  padding: 2rem 0;
+  width: 100%;
+}
+
+.featureSvg {
+  height: 200px;
+  width: 200px;
+}