Make user panel and notification <aside>

src/App.vue

@@ -30,7 +30,7 @@
           <instance-specific-panel v-if="showInstanceSpecificPanel" />
           <features-panel v-if="!currentUser && showFeaturesPanel" />
           <who-to-follow-panel v-if="currentUser && suggestionsEnabled" />
-          <div id="notifs-sidebar" />
+          <aside id="notifs-sidebar" />
         </template>
       </div>
       <main

src/components/mobile_nav/mobile_nav.vue

@@ -42,7 +42,7 @@
         </button>
       </div>
     </nav>
-    <div
+    <aside
       v-if="currentUser"
       class="mobile-notifications-drawer"
       :class="{ '-closed': !notificationsOpen }"
@@ -83,7 +83,7 @@
         ref="mobileNotifications"
         @scroll="onScroll"
       />
-    </div>
+    </aside>
     <SideDrawer
       ref="sideDrawer"
       :logout="logout"

src/components/user_panel/user_panel.vue

 <template>
-  <div class="user-panel">
+  <aside class="user-panel">
     <div
       v-if="signedIn"
       key="user-panel-signed"
@@ -16,7 +16,7 @@
       v-else
       key="user-panel"
     />
-  </div>
+  </aside>
 </template>
 
 <script src="./user_panel.js"></script>