Migrate Microsimulation page to app v2 using new components

Author: v-lerie

app/src/pages/Microsim.page.tsx

@@ -11,7 +11,7 @@ export default function MicrosimPage() {
   const navigate = useNavigate();
   const { countryId } = useParams<{ countryId: string }>();
   return (
-    <Container size='xl'>
+    <Container size="xl">
       <PageHeader
         title="Microsimulation"
         description="How PolicyEngine's tax and benefit models work"