itp: js1: install node: adjust nvm instructions for mac os

[bazmurphy]

What does this change?

• Issue was reported here: https://codeyourfuture.slack.com/archives/C076K3V76CA/p1730546048389919
• Adjusts the Node Setup instructions to work seamlessly for Mac OS
• Instructions tested on a fresh install Mac OS (virtual machine)

baz@bazs-Virtual-Machine ~ % xcode-select --install
xcode-select: note: install requested for command line developer tools
baz@bazs-Virtual-Machine ~ % touch ~/.zshrc
baz@bazs-Virtual-Machine ~ % curl -0- https://raw.githubusercontent.com/nvm-sh/nvm/v0.40.1/install.sh | 
...
=> Appending nvm source string to /Users/baz/.zshrc
=> Appending bash_completion source string to /Users/baz/.zshrc
...
baz@bazs-Virtual-Machine ~ % source ~/.zshrc
baz@bazs-Virtual-Machine ~ % nvm install --lts
...
baz@bazs-Virtual-Machine ~ % node -v 
v22.11.0
baz@bazs-Virtual-Machine ~ % npm -v
10.9.0
baz@bazs-Virtual-Machine ~ % 

Note: if the .zshrc file already exists touch will not overwrite it, and so it is safe to proceed.

Common Content?

• No

Common Theme?

• No

Org Content?

• No

Checklist

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

Who needs to know about this?

ITP Team(?)
Sally/Daniel(?)

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[illicitonion]

Looks good, thanks so much for picking this up!