Accessing WASM Pages in mixed environment host

.AddAdditionalAssemblies allows the host project to discover Page components in a WASM project.

app.MapRazorComponents<RazorComponentThirteen.App>()
    .AddInteractiveWebAssemblyRenderMode()
    .AddAdditionalAssemblies(typeof(Wasm.Pages.Index).Assembly);

The Web Assembly components need to be hosted in a separate project.