Update documentation for Generator development setup

[jelharou]

Update documentation for Generator development setup in CONTRIBUTING.md

Change order so that npm ci is run before npm link.
Close #22732

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Please make sure the below checklist is followed for Pull Requests.

• All continuous integration tests are green
• [] Tests are added where necessary
• [] The JDL part is updated if necessary
• [] jhipster-online is updated if necessary
• Documentation is added/updated where necessary
• [] Coding Rules & Commit Guidelines as per our CONTRIBUTING.md document are followed

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[CLAassistant]

All committers have signed the CLA.

[DanielFran]

Thanks @jelharou for the contribution

[jelharou]

I have claimed the bug bounty: https://opencollective.com/generator-jhipster/expenses/148921

[DanielFran]

@jelharou approved