chore: decrease package size

Author: ehmicky

package.json

@@ -3,6 +3,10 @@
   "version": "2.0.0",
   "description": "run Nextj.s seamlessly on netlify",
   "main": "index.js",
+  "files": [
+    "helpers/**/*.js",
+    "manifest.yml"
+  ],
   "scripts": {
     "format": "prettier --write .",
     "build": "next build test/sample",