feat: Add Tailwind CSS and UI components

- Updated project to use Tailwind CSS for styling.
- Added new UI components including Navbar, Sidebar, Footer,
  Accordion, and Button.
- Created markdown content page for documentation.
- Improved overall structure and design of the application.

sweb/postcss.config.js

@@ -1,6 +1,6 @@
 export default {
   plugins: {
-    tailwindcss: {},
+    '@tailwindcss/postcss': {},
     autoprefixer: {},
   },
 }