fix(README): add doc URL prefix to fix 404s from GH README

[mulderje]

Not sure if these are generated elsewhere, but I was getting 404s from the GH project page without the full URL prefix.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.47%. Comparing base (a633022) to head (87a29e8).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #40      +/-   ##
==========================================
+ Coverage   84.03%   84.47%   +0.44%     
==========================================
  Files           4        4              
  Lines         332      335       +3     
  Branches       60       61       +1     
==========================================
+ Hits          279      283       +4     
- Misses         43       47       +4     
+ Partials       10        5       -5     

Flag	Coverage Δ
macos_latest	84.17% <ø> (+3.45%)	⬆️
ubuntu_latest	72.83% <ø> (-0.96%)	⬇️
windows_latest	4.47% <ø> (-0.05%)	⬇️

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