Scaffold basic workshop frontend.

lib/remark-toc-headings.js

@@ -0,0 +1,15 @@
+import { visit } from 'unist-util-visit'
+import { slug } from 'github-slugger'
+import { toString } from 'mdast-util-to-string'
+
+export default function remarkTocHeadings(options) {
+  return (tree) =>
+    visit(tree, 'heading', (node, index, parent) => {
+      const textContent = toString(node)
+      options.exportRef.push({
+        value: textContent,
+        url: '#' + slug(textContent),
+        depth: node.depth,
+      })
+    })
+}