Add Prettier configuration and format project files

[hichemfantar]

Introduce Prettier configuration for consistent code formatting across the project and update relevant files to adhere to the new formatting standards.

[yungcomputerchair]

Can we limit this to just the app folder? We don't want this formatting things in .github, .vscode, or the README. Prettier should just be used for JS.

[hichemfantar]

Wouldn't it be better to enforce the formatting across as many languages as possible?

[yungcomputerchair]

we definitely don't want huge diffs being committed to, ex, our workflow file with the only tradeoff being opinionated formatting

[hichemfantar]

Are you talking in general or about this particular case because I can undo the changes to the workflow file and you can apply those yourself.

[yungcomputerchair]

Please remove all changes that are not in the app directory and configure the formatter to only apply there as requested.

[yungcomputerchair]

I still see deltas in rust.yml and README.md; please remove as requested.
On top of that, there are merge conflicts.