refactor: remove tutorials which shut down

[joshinihal]

Two links for Node tutorials don't work anymore

Description

The tutorials from Closebrace don't work now as the author has shut down the website. Please remove those links.

Types of changes

• Content Update (change which fixes an issue or updates an already existing submission)
• New Article (change which adds functionality)
• Documentation change

Checklist:

• My code follows the code style of this project.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have made checks to ensure URLs and other resources are valid

[MohammedFaifi]

@enkeyz

[MohammedFaifi]

• [ ]
  Pkg install git