ci: use default build steps of ReadTheDocs again

readthedocs.yml

@@ -4,12 +4,13 @@ build:
   os: ubuntu-22.04
   tools:
     python: '3.11'
-  commands:
-    - pip install poetry
-    - poetry config virtualenvs.create false
-    - cd docs && poetry install
-    - cd docs && cat mkdocs.yml
-    - cd docs && mkdocs build --clean --site-dir $READTHEDOCS_OUTPUT/html --config-file mkdocs.yml
+  jobs:
+    # https://docs.readthedocs.io/en/stable/build-customization.html#install-dependencies-with-poetry
+    post_create_environment:
+      - pip install poetry
+      - poetry config virtualenvs.create false
+    post_install:
+      - poetry install --with docs
 
 mkdocs:
   configuration: mkdocs.yml