Set up abbrs and footnotes

.eleventy.js

@@ -1,4 +1,7 @@
 const pluginRss = require('@11ty/eleventy-plugin-rss')
+const markdownIt = require('markdown-it')
+const footnotes = require('markdown-it-footnote')
+const abbrs = require('markdown-it-abbr')
 
 const { DateTime } = require('luxon')
 const header = require('./src/_includes/filters/header')
@@ -13,6 +16,19 @@ module.exports = function (config) {
   config.addPassthroughCopy('src/assets/key.txt')
   config.addPassthroughCopy('src/assets/ibm-plex/IBM-Plex-Mono/fonts/**/*')
 
+  // configure markdown
+  const mdOptions = {
+    html: true,
+    breaks: true,
+    linkify: true
+  }
+
+  config.setLibrary("md",
+    markdownIt(mdOptions)
+      .use(footnotes)
+      .use(abbrs)
+  )
+
   // template filters
 
   // format dates as YYYY-MM-DD