added /doc/html/unordered.html redirect

[joaquintides]

Closes #325.

[cppalliance-bot]

An automated preview of the documentation is available at https://327.unordered.prtest2.cppalliance.org/libs/unordered/doc/html/index.html

If more commits are pushed to the pull request, the docs will rebuild at the same URL.

2025-10-19 16:50:44 UTC

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.23%. Comparing base (e01b7b5) to head (6025d4d).
⚠️ Report is 2 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #327   +/-   ##
========================================
  Coverage    98.23%   98.23%           
========================================
  Files          161      161           
  Lines        22239    22239           
========================================
  Hits         21847    21847           
  Misses         392      392           

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