[ENH] Update local node and local federation setup instructions

[alyssadai]

Closes #116

Other changes proposed in this pull request:

• Standardized names of .env files to use in local deployments for simplicity
• Fixed example for API_QUERY_URL in local federation
• Provide node name examples with spaces

Checklist

• PR has an interpretable title with a prefix ([ENH], [FIX], [REF], [TST], [CI], [MNT], [INF]) (see https://neurobagel.org/contributing/pull_requests for more info)
• PR links to GitHub issue with mention Closes #XXXX
• Checks pass

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[surchs]

Thanks @alyssadai for the quick fix! I left some comments for things I think need another look (e.g. the link failure is actually meaningful). Please take a look and address, rest is great!

🧑‍🍳