fix build docs command

Author: dfm88

.github/workflows/sphinx.yml

@@ -29,11 +29,10 @@ jobs:
       - name: Install dependencies
         run: |
           pip install poetry
-          poetry install --with docs
+          poetry install --only docs
       - name: Build HTML
         run: |
-          cd docs/
-          make clean html && make html
+          poetry run sphinx-build -b html docs/ docs/_build 
       - name: Run ghp-import (push docs on gh-pages branch to github pages)
         run: |
-          poetry run ghp-import -n -p -f docs/_build/html
+          poetry run ghp-import -n -p -f docs/_build