fix(docs): fix mdbook and mdbook-graphviz incompatibility

- There is an issue with mdbook v0.4.37 and mdbook-graphviz
- [issue 107](dylanowen/mdbook-graphviz#107)

Author: AtomicFS

.github/workflows/documentation-pages.yml

@@ -46,12 +46,16 @@ jobs:
         with:
           path: ${{ env.CARGO_TARGET_DIR }}
           key: mdbook
+      # Issue with mdbook v0.4.37
+      # https://github.com/dylanowen/mdbook-graphviz/issues/107
       - name: Install mdBook
         run: |
           curl --proto '=https' --tlsv1.2 https://sh.rustup.rs -sSf -y | sh
           rustup update
           cargo install \
-            mdbook \
+            --version 0.4.36
+            mdbook
+          cargo install \
             mdbook-admonish \
             mdbook-footnote \
             mdbook-graphviz \