http docs: documentation conversion for http handlers

[gdamore]

This is not yet fully complete, but it's most of the content.

fixes #

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.98%. Comparing base (cd99015) to head (c4ca483).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2088      +/-   ##
==========================================
+ Coverage   83.96%   83.98%   +0.02%     
==========================================
  Files          93       93              
  Lines       23496    23496              
  Branches     3032     3032              
==========================================
+ Hits        19728    19733       +5     
+ Misses       3692     3684       -8     
- Partials       76       79       +3     

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