fix: seo friendly

pages/_document.js

@@ -0,0 +1,15 @@
+import Document, { Html, Head, Main, NextScript } from 'next/document'
+
+export default class MyDocument extends Document {
+  render() {
+    return (
+      <Html lang='fa' dir='rtl'>
+        <Head />
+        <body>
+          <Main />
+          <NextScript />
+        </body>
+      </Html>
+    )
+  }
+}