docs(app): add copy markdown button (#4369)

docs/server/routes/raw/[...slug].md.get.ts

@@ -0,0 +1,30 @@
+import { stringify } from 'minimark/stringify'
+import { withLeadingSlash } from 'ufo'
+
+export default eventHandler(async (event) => {
+  const slug = getRouterParams(event)['slug.md']
+  if (!slug?.endsWith('.md')) {
+    throw createError({ statusCode: 404, statusMessage: 'Page not found', fatal: true })
+  }
+
+  const path = withLeadingSlash(slug.replace('.md', ''))
+  // @ts-expect-error TODO: fix this
+  const page = await queryCollection(event, 'content').path(path).first()
+  if (!page) {
+    throw createError({ statusCode: 404, statusMessage: 'Page not found', fatal: true })
+  }
+
+  // Add title and description to the top of the page if missing
+  if (page.body.value[0]?.[0] !== 'h1') {
+    page.body.value.unshift(['blockquote', {}, page.description])
+    page.body.value.unshift(['h1', {}, page.title])
+  }
+
+  const transformedPage = transformMDC({
+    title: page.title,
+    body: page.body
+  })
+
+  setHeader(event, 'Content-Type', 'text/markdown; charset=utf-8')
+  return stringify({ ...transformedPage.body, type: 'minimark' }, { format: 'markdown/html' })
+})