[DOC] Remove usage instructions & update development environment section in README

[alyssadai]

• Usage instructions removed from README to reduce repetition w/ official documentation

Checklist

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• PR has an interpretable title with a prefix ([ENH], [FIX], [REF], [TST], [CI], [MNT], [INF], [MODEL], [DOC]) (see our Contributing Guidelines for more info)
• PR has a label for the release changelog or skip-release (to be applied by maintainers only)
• 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.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.37%. Comparing base (79a3ebc) to head (74e1b9a).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #365   +/-   ##
=======================================
  Coverage   98.37%   98.37%           
=======================================
  Files          16       16           
  Lines         983      983           
=======================================
  Hits          967      967           
  Misses         16       16           

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[coveralls]

Pull Request Test Coverage Report for Build 11507180406

Details

• 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 98.372%

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Totals
Change from base Build 11444263272:	0.0%
Covered Lines:	967
Relevant Lines:	983

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💛 - Coveralls

[surchs]

🧑‍🍳

[neurobagel-bot]

🚀 PR was released in v0.3.0 🚀