Merge pull request #713 from compas-dev/doc-fix

enable graphviz

Author: tomvanmele

.github/workflows/docs.yml

@@ -24,6 +24,7 @@ jobs:
           python-version: 3.8
       - name: Install dependencies
         run: |
+          sudo apt-get install graphviz
           python -m pip install --upgrade pip
           python -m pip install cython --install-option="--no-cython-compile"
       - name: Install

docs/conf.py

@@ -49,7 +49,7 @@
     "sphinx.ext.githubpages",
     "sphinx.ext.coverage",
     "sphinx.ext.inheritance_diagram",
-    # "sphinx.ext.graphviz",
+    "sphinx.ext.graphviz",
     "matplotlib.sphinxext.plot_directive",
     "m2r",
     "nbsphinx",