[update] sphinx extensions

Dockerfile

@@ -11,7 +11,7 @@ FROM sphinxdoc/sphinx-latexpdf:7.1.2
 
 RUN python -m pip install pip -U && \
       pip install --upgrade myst-parser && \
-      pip install sphinx-rtd-theme sphinxcontrib-fulltoc linkify-it-py sphinxnotes-strike
+      pip install sphinx-rtd-theme sphinxcontrib-fulltoc linkify-it-py sphinxnotes-strike sphinx-mermaid
 
 RUN apt-get update && apt-get install --yes texlive-latex-recommended && apt-get autoremove  && apt-get clean  && rm -rf /var/lib/apt/lists/* # buildkit