[ENH] Document query tool result TSVs

[alyssadai]

Closes #27

NOTE: Checks expected to fail until neurobagel/neurobagel_examples#7 is merged

Changes proposed in this pull request:

• New section "Downloading query results" added to query tool page, which contains the contents of https://github.com/neurobagel/documentation/wiki/Query-Tool with some minor edits for clarity
• Import example query tool results TSVs (see [FEAT] Add query results TSV examples neurobagel_examples#7) to render as markdown tables

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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[rmanaem]

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