Add Kill Switch section

Currently there's a nasty bug which doesn't allow users from navigating
from the "Kill Switch" section to any other section of the app (see bug
twpowertools:59), but everything else is working.

Change-Id: I3c71352b1899e4ddf9ba5886aa1434a5a1ed93eb
diff --git a/frontend/src/pages/NotAuthorized.vue b/frontend/src/pages/NotAuthorized.vue
index f0b0a49..99b81ff 100644
--- a/frontend/src/pages/NotAuthorized.vue
+++ b/frontend/src/pages/NotAuthorized.vue
@@ -1,38 +1,13 @@
 <script>
-import Page from './utils/Page.vue';
+import MiniMessage from './MiniMessage.vue';
 
 export default {
   components: {
-    Page,
+    MiniMessage,
   },
 };
 </script>
 
 <template>
-  <page mini>
-    <div class="layout">
-      <mcw-material-icon class="main-icon" icon="no_accounts" />
-      <span class="label">You're not signed in.</span>
-    </div>
-  </page>
+  <mini-message icon="no_accounts">You're not signed in.</mini-message>
 </template>
-
-<style lang="scss" scoped>
-@use "@material/theme/color-palette" as palette;
-
-.layout {
-  display: flex;
-  flex-direction: column;
-  align-items: center;
-  margin: 16px 0;
-}
-
-.main-icon {
-  font-size: 75px;
-  color: palette.$grey-800;
-}
-
-.label {
-  margin-top: 14px;
-}
-</style>