feat: add comprehensive i18n documentation for Next.js 16 and v7

Author: aymericzip

docs/docs/ar/intlayer_with_nextjs_16.md

@@ -1,6 +1,6 @@
 ---
-createdAt: 2024-12-06
-updatedAt: 2025-10-09
+createdAt: 2025-10-25
+updatedAt: 2025-10-25
 title: How to translate your Next.js 15 app – i18n guide 2025
 description: Discover how to make your Next.js 15 website multilingual. Follow the documentation to internationalize (i18n) and translate it.
 keywords:
@@ -18,6 +18,9 @@ slugs:
 applicationTemplate: https://github.com/aymericzip/intlayer-next-15-template
 youtubeVideo: https://www.youtube.com/watch?v=e_PPG7PTqGU
 history:
+  - version: 7.0.0
+    date: 2025-10-25
+    changes: Added mention of `withIntlayerSync()` function
   - version: 6.2.0
     date: 2025-10-09
     changes: Added docs for `useLocale` hook with `onLocaleChange` option