feat: update installation script and documentation for version 0.2.11 release

src/Directory.Build.props

@@ -1,6 +1,6 @@
 <Project>
   <PropertyGroup>
-    <Version>0.2.10</Version>
+    <Version>0.2.11</Version>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
     <NoWarn>$(NoWarn);CS1591</NoWarn>
   </PropertyGroup>

src/EchoHub.Server/Services/ServerDirectoryService.cs

@@ -7,7 +7,7 @@ namespace EchoHub.Server.Services;
 
 public sealed class ServerDirectoryService : BackgroundService
 {
-    private const string DirectoryHubUrl = "https://echohub.voidcube.cloud/hubs/servers";
+    private const string DirectoryHubUrl = "https://localhost:5001/hubs/servers";
     private static readonly TimeSpan ReconnectBaseDelay = TimeSpan.FromSeconds(2);
     private static readonly TimeSpan ReconnectMaxDelay = TimeSpan.FromSeconds(30);
     private static readonly TimeSpan UserCountMinInterval = TimeSpan.FromSeconds(1);