fix menu memory, return memo button & add favicon

resources/js/views/Memo/MemoIndex.vue

@@ -1,9 +1,7 @@
 <template>
     <div class="p-2">
         <div class="flex-between flex-center mb-1">
-            <a href="#" @click="$router.back()">
-                < Back
-            </a>
+            <a href="#" class="btn" @click="$router.back()">< Back</a>
             <router-link :to="'/memos/create'" class="btn-primary">Add New Memo</router-link>
         </div>
         <div v-if="loading">> Loading...</div>