Correct zensical install for doc creation

[duttonw]

This will fix the broken doc's github action.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 38.52%. Comparing base (cdc846c) to head (c15f817).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master       #8   +/-   ##
=======================================
  Coverage   38.52%   38.52%           
=======================================
  Files          14       14           
  Lines        1238     1238           
=======================================
  Hits          477      477           
  Misses        761      761           

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