feat: use script

scripts/sitemap.ts

@@ -1,4 +1,4 @@
-import { writeFile } from 'fs';
+import { writeFile } from 'fs/promises';
 import { tankDefinitions } from '../src/core/blitzkrieg/tankDefinitions';
 
 console.log('Building sitemap...');
@@ -9,6 +9,6 @@ const sitemap = values
   .map((tank) => `https://blitz-krieg.vercel.app/tools/tankopedia/${tank.id}`)
   .join('\n');
 
-writeFile('public/sitemap.txt', sitemap, () => {});
+await writeFile('public/sitemap.txt', sitemap);
 
 console.log(`Built sitemap for ${values.length} tanks`);