Add Node.js multitenancy guide

[Strift]

Pull Request

Related issue

Fixes #2703

What does this PR do?

This PR repurposes the instructions from this Multi-tenancy guide to create a guide focusing on implementing multi-tenancy with Nodejs.

To be completely honest, I'm a bit hesitant about the value this adds compared to the tenant tokens docs, so feedback is welcome @guimachiavelli @CaroFG

PR checklist

Please check if your PR fulfills the following requirements:

• Does this PR fix an existing issue, or have you listed the changes applied in the PR description (and why they are needed)?
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[CaroFG]

Honestly, I don't think this guide adds anything to the documentation. What we explain here is basically the same as what's in the dedicated section of the documentation. I think it could be a bit longer and add something different, like explaining how to connect the back end and front end.

[Strift]

Thanks for the feedback @CaroFG, I'll see how I can revisit this.

[Strift]

I've updated the guide. I think this is ready for review @CaroFG @guimachiavelli.

[guimachiavelli]

Just a few minor things, mostly suggestions to cut things that might not be necessary.

[Strift]

Thanks for the review @guimachiavelli 🙏 I applied most suggestions and fixed conflicts. All green to merge on my end 👌

[guimachiavelli]

Looks good to go for me. I see @CaroFG had a few comments, so I'll wait for her ok before merging

[CaroFG]

LGTM!

reviewer gave final ok after changes