Revert to attempt 4, which seems to work properly

Author: Michael Lin

.readthedocs.yaml

@@ -15,8 +15,7 @@ build:
     - pip install --editable .
     - git clone https://github.com/pytorch/pytorch_sphinx_theme
     - pip install -e pytorch_sphinx_theme
-    - make html
-      # - python -m sphinx -T -b html -d _build/doctrees -D language=en ./docs/source $READTHEDOCS_OUTPUT/html
+    - python -m sphinx -T -b html -d _build/doctrees -D language=en ./docs/source $READTHEDOCS_OUTPUT/html
 # Build documentation in the docs/ directory with Sphinx
 sphinx:
   configuration: docs/source/conf.py