docs: migrate to nuxt compatibility 4

docs/app/workers/prettier.js

@@ -0,0 +1,29 @@
+/* eslint-disable no-undef */
+import('https://unpkg.com/prettier@3.0.3/standalone.js')
+import('https://unpkg.com/prettier@3.0.3/plugins/html.js')
+import('https://unpkg.com/prettier@3.0.3/plugins/markdown.js')
+
+self.onmessage = async function (event) {
+  self.postMessage({
+    uid: event.data.uid,
+    message: await handleMessage(event.data.message)
+  })
+}
+
+function handleMessage (message) {
+  switch (message.type) {
+    case 'format':
+      return handleFormatMessage(message)
+  }
+}
+
+async function handleFormatMessage (message) {
+  const { options, source } = message
+  const formatted = await prettier.format(source, {
+    parser: 'markdown',
+    plugins: prettierPlugins,
+    ...options
+  })
+
+  return formatted
+}