Add events calendar with ICS feed and switch content naming to English

Elternbeirat.Web/Program.cs

@@ -10,6 +10,7 @@ builder.Services.AddRazorComponents();
 // Content is read once at startup and cached -> singletons.
 builder.Services.AddSingleton<PageService>();
 builder.Services.AddSingleton<PostService>();
+builder.Services.AddSingleton<EventService>();
 
 var app = builder.Build();
 
@@ -40,4 +41,9 @@ app.UseAntiforgery();
 app.MapStaticAssets();
 app.MapRazorComponents<App>();
 
+// Subscribable calendar feed of all events. A minimal API endpoint rather than
+// a Razor page because it returns text/calendar, not HTML.
+app.MapGet("/termine.ics", (EventService events) =>
+    Results.Text(IcsCalendar.Build(events.All), "text/calendar; charset=utf-8"));
+
 app.Run();