Hide disabled features (#2473)

* Hide/show on notify and fediverse feature disable/enable

* Update browser tests to enable features for testing

* Hide/show features in mobile action menu

* Do not show fediauth option if fediverse features are not enabled.

* Force showing tabs when in Storybook

web/components/modals/AuthModal/AuthModal.stories.tsx

@@ -21,7 +21,7 @@ const Example = () => {
 
   return (
     <div>
-      <AuthModal />
+      <AuthModal forceTabs />
     </div>
   );
 };