Apply Sam's Antora recommendations from decimal

[mborland]

No description provided.

[cppalliance-bot]

An automated preview of the documentation is available at https://302.int128.prtest3.cppalliance.org/libs/int128/doc/html/index.html

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

2026-01-29 18:09:14 UTC

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.91%. Comparing base (aba7233) to head (6c49541).
⚠️ Report is 20 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #302   +/-   ##
========================================
  Coverage    98.91%   98.91%           
========================================
  Files           59       59           
  Lines         5245     5245           
  Branches      1609     1609           
========================================
  Hits          5188     5188           
  Misses          30       30           
  Partials        27       27           

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