Fix: Username unique index was case sensitive and this allowed duplicate names.

Feature: Moved temporal products into their own module and reverted the products module

bookie/src/app/product/product-resolver.service.ts

@@ -9,10 +9,10 @@ import { ProductService } from './product.service';
 @Injectable({
   providedIn: 'root',
 })
-export class ProductResolver implements Resolve<Product[]> {
+export class ProductResolver implements Resolve<Product> {
   constructor(private ser: ProductService) {}
 
-  resolve(route: ActivatedRouteSnapshot): Observable<Product[]> {
+  resolve(route: ActivatedRouteSnapshot): Observable<Product> {
     const id = route.paramMap.get('id');
     return this.ser.get(id);
   }