Change main js file in package.json from "main": "index.js" to "main": "gulpfile.js"

Problem/Motivation

Having "main": "index.js" in the package.json files
But the theme dose not use index.js
It's using gulpfile.js

Proposed resolution

Change main js file in package.json from "main": "index.js" to "main": "gulpfile.js"