refactor: organise playwright folders

[ojeytonwilliams]

Checklist:

• I have read and followed the contribution guidelines.
• I have read and followed the how to open a pull request guide.
• My pull request targets the main branch of freeCodeCamp.
• I have tested these changes either locally on my machine, or Gitpod.

The folder structure was a little cluttered, so I tried to structure it a little better.

[ojeytonwilliams]

I need to adjust the mobile config. No need, it's gone to the mobile repo.

[ojeytonwilliams]

Stale