chore(scripts): generic way to build scripts (#829)

* chore: move core scripts

* chore: extract head scripts

assets/js/core/lang.js

@@ -0,0 +1,26 @@
+(function () {
+  const languageSwitchers = document.querySelectorAll('.hextra-language-switcher');
+
+  languageSwitchers.forEach((switcher) => {
+    switcher.addEventListener('click', (e) => {
+      e.preventDefault();
+
+      switcher.dataset.state = switcher.dataset.state === 'open' ? 'closed' : 'open';
+
+      toggleMenu(switcher);
+    });
+  });
+
+  window.addEventListener("resize", () => languageSwitchers.forEach(resizeMenu))
+
+  // Dismiss language switcher when clicking outside
+  document.addEventListener('click', (e) => {
+    if (e.target.closest('.hextra-language-switcher') === null) {
+      languageSwitchers.forEach((switcher) => {
+        switcher.dataset.state = 'closed';
+        const optionsElement = switcher.nextElementSibling;
+        optionsElement.classList.add('hx:hidden');
+      });
+    }
+  });
+})();