enable svg as the default math rendering to fix font issue in safari

Author: mmcky

lectures/_config.yml

@@ -56,7 +56,7 @@ sphinx:
         Macros:
           "argmax" : "arg\\,max"
           "argmin" : "arg\\,min"
-    mathjax_path: https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml-chtml.js
+    mathjax_path: https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml-svg.js
     rediraffe_redirects:
       index_toc.md: intro.md
     tojupyter_static_file_path: ["source/_static", "_static"]