Add scalar UI

Author: webprofusion-chrisc

src/Certify.Server/Certify.Server.HubService/Program.cs

@@ -8,6 +8,7 @@
 using Microsoft.AspNetCore.Mvc.ApplicationParts;
 using Microsoft.AspNetCore.SignalR;
 using Microsoft.AspNetCore.StaticFiles;
+using Scalar.AspNetCore;
 using Serilog;
 
 var builder = WebApplication.CreateBuilder(args);
@@ -70,6 +71,8 @@
 if (app.Environment.IsDevelopment())
 {
     app.MapOpenApi();
+
+    app.MapScalarApiReference();
 }
 
 app.UseHttpsRedirection();