feat: child menu support in navbar (#695)

* feat: implement child menu support in main navbar

- Added a new JavaScript file for handling dropdown functionality in the navbar.
- Implemented event listeners for toggling dropdowns, closing them on outside clicks, and dismissing with the Escape key.
- Updated navbar HTML to support dropdown items with children, enhancing the navigation experience.
- Adjusted core script imports to include the new dropdown functionality.

* chore: update menu identifiers and add missing translations for development versions

* chore: update hugo stats

* chore: update script name

* chore: update menu item names to include arrows for external links

exampleSite/i18n/fa.yaml

@@ -4,3 +4,5 @@ blog: "وبلاگ"
 about: "درباره ما"
 more: "بیشتر"
 hugoDocs: "مستندات هیوگو ↖"
+versions: "نسخه‌ها"
+development: "آخرین نسخه توسعه‌ای"