[Snippets] - add a few useful JS snippets

[jjcantu]

Description

This merge request introduces a couple common Javascript snippets. I also added a new category for color-manipulation.

Type of Change

• ✨ New snippet
• 🛠 Improvement to an existing snippet
• 🐞 Bug fix
• 📖 Documentation update
• 🔧 Other (please describe):

Checklist

• I have tested my code and verified it works as expected.
• My code follows the style and contribution guidelines of this project.
• Comments are added where necessary for clarity.
• Documentation has been updated (if applicable).
• There are no new warnings or errors from my changes.

Related Issues

Closes #

Additional Context

Screenshots (Optional)

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[Mathys-Gasnier]

Thanks for contributing, Could you please remove the javascript and utility tags of all of your snippets ? And take a look at the comment I left before we move on with your snippets

[jjcantu]

@Mathys-Gasnier I addressed everything you mentioned. Please let me know if there is anything else!

[Mathys-Gasnier]

Everything looks good appart from a small little thing

[technoph1le]

@jjcantu Thanks for the contribution. These are really good code snippets. Awesome work 🙌