Add refresh button and automatic refreshing timer to update state.

As effect, this keeps updating the amount of people online.

ServerManagement/Components/Controls/ServerListComponent.razor

@@ -1,3 +1,5 @@
+@using System.Threading;
+
 <table class="table table-striped">
   <RepeaterComponent Items="this.servers">
     <Header>
@@ -21,8 +23,11 @@
   </RepeaterComponent>
 </table>
 
+<button type="button" class="btn btn-primary" onclick=@(() => {base.InvokeAsync(StateHasChanged);})"">Refresh</button>
+
 @code {
   private List<Server>? servers;
+  private Timer? Timer;
 
   [Parameter]
   public string? CityName { get; set; }
@@ -80,6 +85,10 @@
       }
       // Render the component again by letting it know the state changed.
       StateHasChanged();
+
+      Timer = new Timer(_ => {
+        base.InvokeAsync(StateHasChanged);
+      }, null, 4000, 4000);
     }
   }
 }