remove reference CSV files no longer required

[yiwen-h]

Closes #152

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.89%. Comparing base (1f25e6a) to head (4e25d32).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #159   +/-   ##
=======================================
  Coverage   85.89%   85.89%           
=======================================
  Files           9        9           
  Lines         695      695           
  Branches       79       79           
=======================================
  Hits          597      597           
  Misses         89       89           
  Partials        9        9           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[morganle-48]

Ah this was a simpler review than I thought!