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/package.json

@@ -21,6 +21,13 @@
     "vite": "^6.3.5"
   },
   "dependencies": {
-    "lucide-svelte": "^0.509.0"
+    "@tailwindcss/postcss": "^4.1.6",
+    "@tailwindcss/vite": "^4.1.6",
+    "class-variance-authority": "^0.7.1",
+    "clsx": "^2.1.1",
+    "lucide-svelte": "^0.509.0",
+    "marked": "^15.0.11",
+    "shadcn-svelte": "^0.14.2",
+    "tailwind-merge": "^3.2.0"
   }
 }