docs(diagrams): add diagrams using graphviz (#1228)

.readthedocs.yaml

@@ -11,18 +11,8 @@ build:
   os: ubuntu-20.04
   tools:
     python: "3.10"
-
-## apt packages required packages to run cmake on sunshine, note that additional packages are required
-#  apt_packages:
-#    - cmake
-#    - libboost-filesystem-dev
-#    - libboost-log-dev
-#    - libboost-thread-dev
-
-## run cmake
-#  jobs:
-#    pre_build:
-#      - cmake .
+  apt_packages:
+    - graphviz
 
 ## Include the submodules, required for cmake
 #  submodules: