Fixes errors in gh-pages docs recipe # 2

.github/workflows/documentation.yml

@@ -13,6 +13,7 @@ jobs:
       - uses: actions/setup-python@v5
       - name: Install dependencies
         run: |
+          sudo apt-get install pandoc
           pip install -r ./docs/requirements.txt
       - name: Sphinx build
         run: | # sphinx-build doc _build