Update prettier support to be more portable

[bastien-boussouf]

Description

While working on the repository, I figured I could probably make prettier and linting a bit more portable across platforms (I'm working on a mix of Windows / WSL / Linux setups).

The changes I propose are mainly directed at having an .editorconfig file that prettier automatically picks when running and that will also apply to the user IDE. I also propose to align the versions used in the workflow to the one declared in the package.json file.

Type of change

• Bug fix (added a non-breaking change which fixes an issue)

How Has This Been Tested?

• Tested locally with a valid username
• Tested locally with an invalid username
• Ran tests with composer test
• Added or updated test cases to test new features

Checklist:

• I have checked to make sure no other pull requests are open for this issue
• The code is properly formatted and is consistent with the existing code style
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings

Screenshots

[DenverCoder1]

Thanks for contributing! 🎉