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

src/models/landing/car.ts

@@ -0,0 +1,18 @@
+export type RegistrationNumber = string; // А012ВЕ
+
+export type Color = string; // #000000
+
+export const enum BodyStyle {
+  UNKNOWN = 0,
+  SEDAN = 1,
+  HATCHBACK = 2,
+  CROSSOVER = 3,
+  SUV = 4,
+  STATION_WAGON = 5,
+  COUPE = 6,
+  MINIVAN = 7,
+  PICKUP = 8,
+  LIFTBACK = 9,
+  SPORTS_CAR = 10,
+  OTHER = 99
+}