Changed exported file name to index.mjs

[Amaljith-K]

This will fix the following problem while building jsdocs in neeto-molecules

import { matches } from "@bigbinary/neeto-cist";
^^^^^^^
SyntaxError: Named export 'matches' not found. The requested module '@bigbinary/neeto-cist' is a CommonJS module, which may not support all module.exports as named exports.
CommonJS modules can always be imported via the default export, for example using:

import pkg from '@bigbinary/neeto-cist';
const { matches } = pkg;

Checklist

• I have made corresponding changes to the documentation
• I have verified the generated JSDoc comments
• I have updated the types definition of modified exports
• I have added jest tests for newly added changes
• I have verified the functionality in some of the neeto web-apps.

@ajmaln _a
cc @josephmathew900

[Amaljith-K]

@ajmaln and @josephmathew900 JSDoc generation is broken in neeto-molecules since https://github.com/bigbinary/neeto-molecules/pull/787 because of some major upgrades to some packages like unified.

@anmol-kumar0815 @CalvinChiramal why didn't you guys notice this error when running yarn bundle?
Or haven't you tested it at all?

[CalvinChiramal]

@Amaljith-K This error did not come up locally when I ran yarn bundle and even the PR app got deployed without any issues. I had only assigned for review after that.
I could only recreate this locally yesterday when I deleted the node_modules folder and ran yarn bundle again. I had not tested it by deleting node_modules and since the PR app got deployed I expected that everything was fine.

[anmol-kumar0815]

@Amaljith-K I also did not encounter this error locally. The only error I faced was when running the Storybook, and later, I found the solution here.