Remove Windows CI. Fix javadoc URLs.

[rnc]

Seems to help CI issues found when #1039 was submitted.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.92%. Comparing base (5cd1e33) to head (2270aca).
⚠️ Report is 55 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1040      +/-   ##
============================================
+ Coverage     83.84%   83.92%   +0.08%     
- Complexity     1948     1967      +19     
============================================
  Files           120      121       +1     
  Lines          7180     7187       +7     
  Branches       1228     1231       +3     
============================================
+ Hits           6020     6032      +12     
+ Misses          674      673       -1     
+ Partials        486      482       -4     

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