[FIX] Update environment variable name and link to query tool README

[alyssadai]

• Closes #179

Changes proposed in this pull request:

• API_QUERY_URL replaced by NB_API_QUERY_URL
• Using mkdocs-include-markdown-plugin, query tool documentation page contents replaced by link to query tool README sections where appropriate for easier syncing

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[alyssadai]

Hey @rmanaem, thanks for catching that!

I think since the deployment recipes and docs have been already modified anyways related to this variable, I would say we can go ahead and change the port to the one used by the container to the Vite default for now. This way, at least our current instructions will work in the interim before we switch to the single-Compose recipe, and we can decide when we refine that new single-Compose file whether we want to keep this port or not.

Will request your review on a PR for this port change in the recipes repo !