로그아웃 기능 추가

client/pages/profile.vue

@@ -6,6 +6,7 @@
         <div class="col-sm-6">
           <div class="a-spacing-top-medium"></div>
           <h2>Profile Page</h2>
+          <a @click="onLogout" href="#">logout</a>
           <form action="">
             <!-- Name -->
             <div class="a-spacing-top-medium">
@@ -77,6 +78,9 @@ export default {
       } catch (err) {
         console.log(err)
       }
+    },
+    async onLogout() {
+      this.$auth.logout()
     }
   }
 }