ci: Fix docs workflow

.github/workflows/build_and_publish_docs.yml

@@ -22,15 +22,8 @@ jobs:
         with:
           python-version: 3.9
 
-      - name: setup poetry
-        run: |
-          python -m pip install --upgrade pip poetry
-
-      - name: install dependencies
-        run: poetry install
-
       - name: build documentation
-        run: poetry run make -C docs html
+        run: make build_docs
 
       - name: remove jekyll theming
         run: touch docs/_build/html/.nojekyll