Create action to validate docs

tox.ini

@@ -44,27 +44,6 @@ deps =
   ruff
 basepython = python3.10
 
-[testenv:docs]
-# Running sphinx from inside the "docs" directory
-# ensures it will not pick up any stray files that might
-# get into a virtual environment under the top-level directory
-# or other artifacts under build/
-changedir = docs
-# The only dependency is sphinx
-# If we were using extensions packaged separately,
-# we would specify them here.
-# A better practice is to specify a specific version of sphinx.
-deps =
-    sphinx
-    sphinx_rtd_theme
-# This is the sphinx command to generate HTML.
-# In other circumstances, we might want to generate a PDF or an ebook
-commands =
-    sphinx-build -W -b html -d {envtmpdir}/doctrees . {envtmpdir}/html
-# We use Python 3.8. Tox sometimes tries to autodetect it based on the name of
-# the testenv, but "docs" does not give useful clues so we have to be explicit.
-basepython = python3.8
-
 [testenv]
 # Need to use develop install so that paths
 # for aggregate code coverage combine