Remove iron workflow and update readme (backport #90)

[mergify]

Due after the next patch release on November 15th.

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This is an automatic backport of pull request #90 done by [Mergify](https://mergify.com).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.72%. Comparing base (c94529c) to head (421d311).
Report is 1 commits behind head on humble.

Additional details and impacted files

@@           Coverage Diff           @@
##           humble      #95   +/-   ##
=======================================
  Coverage   72.72%   72.72%           
=======================================
  Files           4        4           
  Lines         209      209           
  Branches      134      134           
=======================================
  Hits          152      152           
  Misses         25       25           
  Partials       32       32           

Flag	Coverage Δ
unittests	72.72% <ø> (ø)

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