Convert cjs files to js files and rely on default

[gaber85]

Description

This PR attempts at converting cjs extension files to js files and just rely on the default settings.

For more information visit the Node documentation section on package.json and file extensions

As a bonus, I've updated the dev script with an --open flag so the browser opens when npm run dev gets executed.

Feel free to comment with any questions and I'll gladly address them.

Motivation and Context

As per the documentation, node interprets js files as commonJS depending on what is passed. By default it allows js files to be interpreted as expected. Given that many of these files are using commonJS e.g. module.exports{}, it only makes sense to rely on the default setup.

How Has This Been Tested?

The changes pass the pipeline and the app runs as expected.

Checklist:

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] My changes generate no new warnings

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[SauveJeanLuc]

Great job. @all-contributors add @gaber85 for code.

[allcontributors[bot]]

@SauveJeanLuc

@gaber85 already contributed before to code