fix: Configure Next.js for GitHub Pages deployment

- Add basePath and assetPrefix configuration for /design path
- Fix asset loading issues on GitHub Pages
- Update build configuration for proper static export
- Ensure all assets load correctly from /design/ subdirectory

Author: mmaxence

next.config.ts

@@ -3,6 +3,8 @@ import type { NextConfig } from "next";
 const nextConfig: NextConfig = {
   output: 'export',
   trailingSlash: true,
+  basePath: '/design',
+  assetPrefix: '/design',
   images: {
     unoptimized: true,
   },