cleaned up JS

static/js/sidemenu.js

@@ -0,0 +1,31 @@
+/*
+    This script is responsible for opening and closing the menu from the side.
+*/
+function openNav() {
+    document.getElementById("mySidenav").style.width = "250px";
+    document.body.classList.add('menu-open');
+}
+
+function closeNav() {
+    document.getElementById("mySidenav").style.width = "0";
+    document.body.classList.remove('menu-open');
+}
+
+function setTheme(theme) {
+    window.location.href = '/search?theme=' + theme;
+}
+
+function updateLanguage(langCode) {
+    // Send AJAX request to update language settings
+    const xhr = new XMLHttpRequest();
+    xhr.open('POST', '/updateSettings', true);
+    xhr.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
+    xhr.onload = function () {
+        if (this.status >= 200 && this.status < 300) {
+            location.reload();
+        } else {
+            console.error('Failed to update language.');
+        }
+    };
+    xhr.send(encodeURI('site_lang=' + langCode));
+}