Routing Forms - Avoid Flicker, Fix preload of Cal Font (#3368)

* Fix flicker due to Shell on Routing Form pages. Fix font preload(unrealted to routing forms)

* Update _app.tsx

Co-authored-by: Omar López <zomars@me.com>

packages/app-store/ee/routing_forms/components/RoutingNavBar.tsx

@@ -22,7 +22,7 @@ export default function RoutingNavBar({
   ];
   return (
     <div className="mb-4">
-      <NavTabs tabs={tabs} linkProps={{ shallow: true }} />
+      <NavTabs tabs={tabs} />
     </div>
   );
 }