fixup docs

[jeromekelleher]

• Standardise docs build: use PKG_VERSION, uv-based build.sh, minimal Makefile
• Update min_python_version to 3.11

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.82%. Comparing base (707f478) to head (14fd124).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2507   +/-   ##
=======================================
  Coverage   93.82%   93.82%           
=======================================
  Files          20       20           
  Lines       12118    12118           
  Branches     2242     2242           
=======================================
  Hits        11370    11370           
  Misses        569      569           
  Partials      179      179           

Flag	Coverage Δ
C	84.10% <ø> (ø)
c-python	72.92% <ø> (ø)
python-tests	98.58% <ø> (ø)

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Components	Coverage Δ
Python API	98.61% <ø> (ø)
Python C interface	92.80% <ø> (ø)
C library	91.04% <ø> (ø)

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