feat: initialize Next.js app with Tailwind CSS and custom global styles

- Added global CSS file with Tailwind CSS imports and custom styles for light and dark themes.
- Created layout component to include Google Fonts and set up metadata for the application.
- Developed main page layout with responsive design, including navigation and footer links.
- Configured TypeScript settings for the project with strict type checking and module resolution.

postcss.config.mjs

@@ -0,0 +1,5 @@
+const config = {
+  plugins: ["@tailwindcss/postcss"],
+};
+
+export default config;