Fixed diagrams not shown

Author: fmachadopiriz

.github/workflows/pages.yaml

@@ -20,8 +20,8 @@ jobs:
       - uses: actions/checkout@v4
         with:
           submodules: recursive
-      - name: Install Doxygen
-        run: sudo apt-get update && sudo apt-get install -y doxygen
+      - name: Install Doxygen and Graphviz
+        run: sudo apt-get update && sudo apt-get install -y doxygen graphviz
       - name: Generate Documentation
         run: cd docs && doxygen Doxyfile
       - name: Copy doxygen-awesome files