Ensure that docs dependencies are installed for continuous integration.

.github/workflows/continuous-integration-documentation.yml

@@ -39,7 +39,7 @@ jobs:
       - name: Install Package Dependencies
         run: |
           poetry run python -m pip install --upgrade pip
-          poetry install
+          poetry install --with docs,optional,graphviz,meshing
           poetry run python -c "import imageio;imageio.plugins.freeimage.download()"
         shell: bash
       - name: Build Documentation