add check login

src/js/09-check-login.js

-// eslint-disable-next-line no-undef
-fetch('/web/dms/api/auth/status')
-  .then((response) => {
-    if (response.url === 'https://swlab.bwg.co.kr/web/dms/login') {
+/* eslint-disable no-undef */
+function removeSecretNav () {
   const elements = document.getElementsByClassName('secret-nav')
   while (elements.length > 0) {
     elements[0].parentNode.removeChild(elements[0])
   }
+}
+
+fetch('/web/dms/api/auth/status')
+  .then((response) => {
+    if (response.url === 'https://swlab.bwg.co.kr/web/dms/login') {
+      removeSecretNav()
     }
   })
   .catch((error) => {
     console.error('Error checking login status:', error)
+    removeSecretNav()
   })