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/hugo_stats.json

@@ -121,6 +121,9 @@
       "hextra-max-footer-width",
       "hextra-max-navbar-width",
       "hextra-max-page-width",
+      "hextra-nav-menu-item",
+      "hextra-nav-menu-items",
+      "hextra-nav-menu-toggle",
       "hextra-pdf",
       "hextra-scrollbar",
       "hextra-sidebar-collapsible-button",
@@ -311,6 +314,7 @@
       "hx:duration-200",
       "hx:duration-75",
       "hx:ease-in",
+      "hx:ease-in-out",
       "hx:first:mt-0",
       "hx:flex",
       "hx:flex-col",