chore: simplify build script in package.json

- Removed sitemap generation step from the build script for a more streamlined build process.

package.json

@@ -5,7 +5,7 @@
   "type": "module",
   "scripts": {
     "dev": "vite",
-    "build": "npm run generate:sitemap && tsc -b && vite build",
+    "build": "tsc -b && vite build",
     "generate:sitemap": "tsx scripts/generate-sitemap.ts",
     "lint": "eslint .",
     "preview": "vite preview",