Monorepo structure, remove Gulp, new build process (#2116)

core/js/src/switch-icon.js

@@ -0,0 +1,11 @@
+/*
+Switch icons
+ */
+let switchesTriggerList = [].slice.call(document.querySelectorAll('[data-bs-toggle="switch-icon"]'));
+switchesTriggerList.map(function (switchTriggerEl) {
+	switchTriggerEl.addEventListener('click', (e) => {
+		e.stopPropagation();
+
+		switchTriggerEl.classList.toggle('active');
+	});
+});