Formatting in Jupyter Notebooks (#516)

Jupyter notebook math expressions were not rendering locally or in
docker container - update made to conf.py to fix.

[ reviewed by @mellis13 @al-rigazzi ]
[ committed by @amandarichardsonn ]

doc/conf.py

@@ -54,6 +54,7 @@
     'sphinx_copybutton',
     'sphinx_tabs.tabs',
     'sphinx_design',
+    'sphinx.ext.mathjax',
 ]
 
 autodoc_mock_imports = ["smartredis.smartredisPy"]
@@ -62,6 +63,9 @@
 # Add any paths that contain templates here, relative to this directory.
 templates_path = ['_templates']
 
+# The path to the MathJax.js file that Sphinx will use to render math expressions
+mathjax_path = 'https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml-chtml.js'
+
 # List of patterns, relative to source directory, that match files and
 # directories to ignore when looking for source files.
 # This pattern also affects html_static_path and html_extra_path.