[REF] Remove environment variable table from README

[alyssadai]

Closes #153

Changes proposed in this pull request:

• Moved environment variables table into separate TSV file to link to from the official docs using mkdocs-yamp
• Simplified README to link to docs section on environment variables (which includes a copy of info about configuring origins, etc.) to keep README focused on installation and launch steps
• Moved info for deploying a query tool as part of the Compose network to the docker compose section

Checklist

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

For new features:

• Tests have been added

For bug fixes:

• There is at least one test that would fail under the original bug conditions.

[coveralls]

Pull Request Test Coverage Report for Build 6125792347

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 6113947017:	0.0%
Covered Lines:	368
Relevant Lines:	368

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💛 - Coveralls

[rmanaem]

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