replace deprecated next lint with eslint

package.json

@@ -8,7 +8,7 @@
     "dev": "next dev --turbopack",
     "build": "next build",
     "start": "next start -p 9000",
-    "lint": "next lint",
+    "lint": "eslint .",
     "format": "prettier --write \"**/*.{js,jsx,ts,tsx,json,md}\""
   },
   "dependencies": {