fix menu memory, return memo button & add favicon

resources/js/views/Memo/MemoEdit.vue

@@ -1,9 +1,7 @@
 <template>
     <div class="memo-edit p-2">
         <div class="flex-between mb-1">
-            <a href="#" @click="$router.back()" class="link">
-                < Back
-            </a>
+            <router-link :to="'/memos/' + this.$route.params.id" class="btn">< Back</router-link>
             <button class="btn-alert mr-1">Cancel</button>
         </div>
         <form @submit.prevent="submitForm">