Docstrings to docs

[mrgah]

Copied module docstrings from:

• parse_history.py
• process_reviews.py
• update_contributors.py
• update_review_teams.py

into README.md under the Usage section, with slight tweaks.

Updated code of conduct link to https://www.pyopensci.org/handbook/CODE_OF_CONDUCT.html.

[lwasser]

@all-contributors add @mrgah for code, review

[allcontributors]

@lwasser

I've put up a pull request to add @mrgah! 🎉

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.38%. Comparing base (7ee78f9) to head (23bb35a).
Report is 14 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #281   +/-   ##
=======================================
  Coverage   80.38%   80.38%           
=======================================
  Files          11       11           
  Lines         724      724           
  Branches       92       92           
=======================================
  Hits          582      582           
  Misses        132      132           
  Partials       10       10           

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