Add TOC to posts

.eleventy.js

@@ -1,13 +1,18 @@
 const pluginRss = require('@11ty/eleventy-plugin-rss')
+const pluginToc = require('eleventy-plugin-nesting-toc')
+
+// extra features for markdown
 const markdownIt = require('markdown-it')
-const footnotes = require('markdown-it-footnote')
+const anchors = require('markdown-it-anchor')
 const abbrs = require('markdown-it-abbr')
+const footnotes = require('markdown-it-footnote')
 
 const { DateTime } = require('luxon')
 const header = require('./src/_includes/filters/header')
 
 module.exports = function (config) {
   config.addPlugin(pluginRss)
+  config.addPlugin(pluginToc)
 
 	config.setBrowserSyncConfig({
 		files: './_site/assets/*.css'
@@ -25,6 +30,7 @@ module.exports = function (config) {
 
   config.setLibrary("md",
     markdownIt(mdOptions)
+      .use(anchors)
       .use(footnotes)
       .use(abbrs)
   )