simplify HiddenFromSSR

routes/_components/HiddenFromSSR.html

@@ -1,22 +1,9 @@
 <!-- toggled in 2xx.html based on whether the user is logged in or not -->
-<div class="hidden-from-ssr {{shown ? 'shown' : ''}}">
+<div class="hidden-from-ssr">
   <slot></slot>
 </div>
 <style>
   .hidden-from-ssr {
     opacity: 0;
   }
-  .hidden-from-ssr.shown {
-    opacity: 1;
-  }
 </style>
-<script>
-  export default {
-    oncreate () {
-      this.set({ shown: true })
-    },
-    data: () => ({
-      shown: false
-    })
-  }
-</script>