CI: replace ammaraskar/sphinx-action with custom run commands

.github/workflows/ci.yml

@@ -17,9 +17,9 @@ jobs:
         python-version:
         - "3.11"
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v4
+      uses: actions/setup-python@v5
       with:
         python-version: ${{ matrix.python-version }}
     - name: Install dependencies
@@ -35,15 +35,17 @@ jobs:
     runs-on: ubuntu-latest
     if: github.ref == 'refs/heads/main'
     steps:
-    - uses: actions/checkout@v1
-    - name: Build documentation
-      uses: ammaraskar/sphinx-action@master
+    - uses: actions/checkout@v4
+    - name: Set up Python
+      uses: actions/setup-python@v5
       with:
-        pre-build-command: |
-          python -m pip install --upgrade pip setuptools wheel
-          python -m pip install -e .[docs]
-          sphinx-apidoc --force --output-dir docs/source qunfold
-        docs-folder: "docs/"
+        python-version: 3.11
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip setuptools wheel
+        python -m pip install -e .[docs]
+    - name: Build documentation
+      run: sphinx-build -M html docs/source docs/build
     - name: Publish documentation
       run: |
         git clone ${{ github.server_url }}/${{ github.repository }}.git --branch gh-pages --single-branch __gh-pages/