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

assets/js/nav-menu.js

@@ -0,0 +1,61 @@
+(function () {
+  const dropdownToggles = document.querySelectorAll(".hextra-nav-menu-toggle");
+
+  dropdownToggles.forEach((toggle) => {
+    toggle.addEventListener("click", (e) => {
+      e.preventDefault();
+      e.stopPropagation();
+
+      // Close all other dropdowns first
+      dropdownToggles.forEach((otherToggle) => {
+        if (otherToggle !== toggle) {
+          otherToggle.dataset.state = "closed";
+          const otherMenuItems = otherToggle.nextElementSibling;
+          otherMenuItems.classList.add("hx:hidden");
+        }
+      });
+
+      // Toggle current dropdown
+      const isOpen = toggle.dataset.state === "open";
+      toggle.dataset.state = isOpen ? "closed" : "open";
+      const menuItemsElement = toggle.nextElementSibling;
+
+      if (!isOpen) {
+        // Position dropdown centered with toggle
+        menuItemsElement.style.position = "absolute";
+        menuItemsElement.style.top = "100%";
+        menuItemsElement.style.left = "50%";
+        menuItemsElement.style.transform = "translateX(-50%)";
+        menuItemsElement.style.zIndex = "1000";
+
+        // Show dropdown
+        menuItemsElement.classList.remove("hx:hidden");
+      } else {
+        // Hide dropdown
+        menuItemsElement.classList.add("hx:hidden");
+      }
+    });
+  });
+
+  // Dismiss dropdown when clicking outside
+  document.addEventListener("click", (e) => {
+    if (e.target.closest(".hextra-nav-menu-toggle") === null) {
+      dropdownToggles.forEach((toggle) => {
+        toggle.dataset.state = "closed";
+        const menuItemsElement = toggle.nextElementSibling;
+        menuItemsElement.classList.add("hx:hidden");
+      });
+    }
+  });
+
+  // Close dropdowns on escape key
+  document.addEventListener("keydown", (e) => {
+    if (e.key === "Escape") {
+      dropdownToggles.forEach((toggle) => {
+        toggle.dataset.state = "closed";
+        const menuItemsElement = toggle.nextElementSibling;
+        menuItemsElement.classList.add("hx:hidden");
+      });
+    }
+  });
+})();