add katex in config

_config.yml

@@ -20,18 +20,21 @@
 
 title: 6.790 Machine Learning
 email: [email protected]
-description: "Graduate Machine Learning course from MIT EECS. Fall 2023 term."
+description: "Graduate Machine Learning course, MIT EECS, fall 2023 term."
 
 baseurl: "/" # the subpath of your site, e.g. /blog
 url: "https://gradml.mit.edu" # the base hostname & protocol for your site, e.g. http://example.com
 
 
 # Build settings
+# remote_theme: "just-the-docs"
 theme: "just-the-docs"
 #remote_theme: just-the-docs/just-the-docs
 plugins:
   - jekyll-feed
   - jekyll-default-layout
+math: katex
+# math: mathjax
 # Exclude from processing.
 # The following items will not be processed, by default.
 # Any item listed under the `exclude:` key here will be automatically added to