feat: modernize front-end

[remcolakens]

Context

To stay up to date with modern front-end structure, this PR has added the "new" src directory for better file management. Additionally, some dependencies have been updated.

Changes

• Added ./src/app directory.
• Renamed postcss.config.js to postcss.config.mjs.
• Added e2e to the ignore path of Jest.

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have tested my code for breaking changes and added the corresponding footer in this PR if needed
• I have added tests that prove my fix is effective or that my feature works

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[remcolakens]

🎉 This PR is included in version 3.2.0 🎉

The release is available on GitHub release

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