Clean up and formalize more options

[timkpaine]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 39.13043% with 14 lines in your changes missing coverage. Please review.
✅ Project coverage is 57.64%. Comparing base (9a79ac3) to head (3145d3c).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
yardang/build.py	33.33%	6 Missing and 4 partials ⚠️
yardang/conf.py.j2	50.00%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main      #75       +/-   ##
===========================================
- Coverage   76.42%   57.64%   -18.78%     
===========================================
  Files           5        6        +1     
  Lines         123      255      +132     
  Branches       21       45       +24     
===========================================
+ Hits           94      147       +53     
- Misses         19       94       +75     
- Partials       10       14        +4     

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