add order form page models, reorder landing models (#8)

src/models/landing/index.ts

@@ -1 +1,6 @@
+export * as Car from './car';
+export * as Customer from './customer';
+export * as Washing from './washing';
+export * as Order from './order'; // import: Car, Customer, Washing
+export * as Review from './review';
 export * from './stubs';