Temporarily evade sphinx-doc/sphinxext-opengraph#87

Author: Julian

tox.ini

@@ -95,6 +95,10 @@ commands = {envpython} -m mypy --config {toxinidir}/pyproject.toml {posargs} {to
 
 [testenv:docs-dirhtml]
 commands = {envpython} -m sphinx -b dirhtml {toxinidir}/docs/ {envtmpdir}/build {posargs:-a -n -q -T -W}
+# REMOVEME: See https://github.com/wpilibsuite/sphinxext-opengraph/issues/87
+setenv =
+    {[testenv]setenv}
+    READTHEDOCS=true
 deps =
     -r{toxinidir}/docs/requirements.txt