Add Simple HTML docs

[wolveix]

This adds simple docs for returning HTML (closes #786)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.54%. Comparing base (1cd5c26) to head (181aa5c).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #941   +/-   ##
=======================================
  Coverage   92.54%   92.54%           
=======================================
  Files          23       23           
  Lines        4481     4481           
=======================================
  Hits         4147     4147           
  Misses        275      275           
  Partials       59       59           

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