Removed migrations. New onboarding screen and wizard like steps.

Wino.Mail.WinUI/CoreUWPContainerSetup.cs

@@ -49,6 +49,7 @@ public static class CoreUWPContainerSetup
         services.AddTransient(typeof(AboutPageViewModel));
         services.AddTransient(typeof(SettingsPageViewModel));
         services.AddTransient(typeof(ManageAccountsPagePageViewModel));
+        services.AddTransient(typeof(WelcomeHostPageViewModel));
         services.AddTransient(typeof(KeyboardShortcutsPageViewModel));
     }
 }