Revert "Installed eleventy-plugin-mathjax plugin...I think? I'm doing…

… it via the Github web editor, so I didn't install the NPM package locally"

This reverts commit fb7579d.

.eleventy.js

@@ -1,12 +1,10 @@
 var moment = require('moment');
 const syntaxHighlight = require('@11ty/eleventy-plugin-syntaxhighlight');
 const eleventyNavigationPlugin = require("@11ty/eleventy-navigation");
-const mathjaxPlugin = require("eleventy-plugin-mathjax");
 
 module.exports = function(eleventyConfig) {
   eleventyConfig.addPlugin(syntaxHighlight);
   eleventyConfig.addPlugin(eleventyNavigationPlugin);
-  eleventyConfig.addPlugin(mathjaxPlugin);
 
   eleventyConfig.setTemplateFormats([
     "md",

package.json

@@ -34,7 +34,6 @@
     "markdown-it-container": "^3.0.0",
     "markdown-it-emoji": "^2.0.0",
     "markdown-it-footnote": "^3.0.2",
-    "node-fetch": "^2.6.1",
-    "eleventy-plugin-mathjax": "^2.0.4"
+    "node-fetch": "^2.6.1"
   }
 }