Add new page on binary floating point conversions

[mborland]

Partly address: #1188

[cppalliance-bot]

An automated preview of the documentation is available at https://1249.decimal.prtest3.cppalliance.org/libs/decimal/doc/html/index.html

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

2025-11-17 12:32:50 UTC

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.1%. Comparing base (ae9076b) to head (c6b4c49).
⚠️ Report is 5 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff           @@
##           develop   #1249   +/-   ##
=======================================
  Coverage     99.1%   99.1%           
=======================================
  Files          264     264           
  Lines        17251   17251           
  Branches      1931    1931           
=======================================
  Hits         17079   17079           
  Misses         172     172           

see 1 file with indirect coverage changes

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