feat: init @affine/docs (#2849)

apps/docs/src/app.tsx

@@ -0,0 +1,26 @@
+'use server';
+import fs from 'node:fs/promises';
+import path from 'node:path';
+
+import type { ReactElement } from 'react';
+import { lazy } from 'react';
+
+const Editor = lazy(() =>
+  import('./components/editor.js').then(({ Editor }) => ({ default: Editor }))
+);
+
+const markdown = await fs.readFile(path.join('./src/pages/index.md'), {
+  encoding: 'utf-8',
+});
+
+const App = (): ReactElement => {
+  return (
+    <div>
+      <div className="mt-5">
+        <Editor text={markdown} />
+      </div>
+    </div>
+  );
+};
+
+export default App;