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/public/images/introduction/sample-image.svg

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg width="800" height="400" xmlns="http://www.w3.org/2000/svg">
+  <rect width="800" height="400" fill="#f3f4f6" />
+  <text x="400" y="200" font-family="Arial" font-size="48" text-anchor="middle" fill="#1e40af">Sample Image</text>
+  <text x="400" y="250" font-family="Arial" font-size="24" text-anchor="middle" fill="#4b5563">800 x 400</text>
+</svg>