removing mobile submenu functionality as we have no need for it

opentech/static_src/src/javascript/components/mobile-sub-menu.js

-class MobileSubMenu {
-    static selector() {
-        return '.header__menus--mobile .js-open-subnav';
-    }
-
-    constructor(node) {
-        this.node = node;
-        this.bindEventListeners();
-    }
-
-    bindEventListeners() {
-        this.node.on('click', (e) => {
-            e.preventDefault();
-            this.open();
-        });
-    }
-
-    open() {
-        this.node[0].parentElement.nextElementSibling.classList.add('is-visible');
-    }
-}
-
-export default MobileSubMenu;

opentech/static_src/src/javascript/main.js

 import $ from './globals';
 import MobileMenu from './components/mobile-menu';
-import MobileSubMenu from './components/mobile-sub-menu';
 import DesktopSearch from './components/desktop-search';
 
 // Open the mobile menu callback
@@ -20,10 +19,6 @@ $(function () {
         new MobileMenu($(el), openMobileMenu, closeMobileMenu);
     });
 
-    $(MobileSubMenu.selector()).each((index, el) => {
-        new MobileSubMenu($(el));
-    });
-
     $(DesktopSearch.selector()).each((index, el) => {
         new DesktopSearch($(el), $('.header__search--desktop'));
     });