Update node module coursework links for the module-node repo

[llamojha]

What does this change?

Module: Node Week(s): 1, 2 and 3

Checklist

• [x] I have read the contributing guidelines
• [x] I have checked my spelling and grammar with an automated tool
• [x] I have previewed my changes to check the markdown renders as I intend
• [x] I have run my code to check it works
• [x] My changes follow our Style Guide

Description

Update node module coursework links for the module-node repo to make it consistent across the module and avoiding confusion and broken links.

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