manage conflict (generic way) use toast to show error (#588)

* manage conflict (generic way) use toast to show error

* fix httpservice after merge conflict, adapt to use new repository

src/Web/Startup.cs

@@ -158,6 +158,8 @@ namespace Microsoft.eShopWeb.Web
             services.AddBlazoredLocalStorage();
             services.AddServerSideBlazor();
 
+
+            services.AddScoped<ToastService>();
             services.AddScoped<HttpService>();
             services.AddBlazorServices();