feat: Convert to modules

package.json

@@ -4,7 +4,7 @@
   "description": "",
   "license": "ISC",
   "author": "Jakub Žitník",
-  "type": "commonjs",
+  "type": "module",
   "main": "server.js",
   "scripts": {
     "start": "concurrently \"node server.js\" \"node cron-runner.js\""
@@ -14,7 +14,6 @@
     "concurrently": "^9.2.0",
     "express": "^5.1.0",
     "node-cron": "^4.2.1",
-    "node-fetch": "^3.3.2",
     "puppeteer": "^24.10.0",
     "xlsx": "^0.18.5"
   }