Don't preload timelines as props, load them when timeline component is mounted

This prevents the bug where if you go "back" to the UI after navigating to
another page it loads with the old set of statuses

app/helpers/home_helper.rb

@@ -2,13 +2,7 @@ module HomeHelper
   def default_props
     {
       token: @token,
-
-      account: render(file: 'api/v1/accounts/show', locals: { account: current_user.account }, formats: :json),
-
-      timelines: {
-        home: render(file: 'api/v1/statuses/index', locals: { statuses: @home }, formats: :json),
-        mentions: render(file: 'api/v1/statuses/index', locals: { statuses: @mentions }, formats: :json)
-      }
+      account: render(file: 'api/v1/accounts/show', locals: { account: current_user.account }, formats: :json)
     }
   end
 end