Upgrade: Docusaurus 2.0.0-beta.18 → 3.9.2, React 17 → 18, and all dependencies to latest versions

- Upgraded @docusaurus/core and @docusaurus/preset-classic to 3.9.2
- Upgraded React and React-DOM to 18.3.1
- Upgraded @mdx-js/react to 3.1.1
- Upgraded prism-react-renderer to 2.4.1 (fixed import syntax)
- Upgraded react-icons to 5.5.0
- Upgraded clsx to 2.1.1
- Fixed prism-react-renderer import for v2 API
- Fixed onBrokenMarkdownLinks deprecation warning
- Reduced vulnerabilities from 28 to 3 (only in dev dependency nodemon)

Author: saiyam1814

docusaurus.config.js

@@ -1,8 +1,9 @@
 // @ts-check
 // Note: type annotations allow type checking and IDEs autocompletion
 
-const lightCodeTheme = require("prism-react-renderer/themes/github");
-const darkCodeTheme = require("prism-react-renderer/themes/dracula");
+const {themes} = require('prism-react-renderer');
+const lightCodeTheme = themes.github;
+const darkCodeTheme = themes.dracula;
 
 /** @type {import('@docusaurus/types').Config} */
 const config = {
@@ -11,7 +12,11 @@ const config = {
   url: "https://kubesimplify.com",
   baseUrl: "/",
   onBrokenLinks: "ignore", //  We will change this to "throw" when proper setup is done
-  onBrokenMarkdownLinks: "warn",
+  markdown: {
+    hooks: {
+      onBrokenMarkdownLinks: "warn",
+    },
+  },
   favicon: "img/favicon.ico",
   organizationName: "kubesimplify", // Usually your GitHub org/user name.
   projectName: "website", // Usually your repo name.