Code cleanup.

backend/src/Squidex.Infrastructure/States/ISnapshotStore.cs

@@ -6,7 +6,6 @@
 // ==========================================================================
 
 using System;
-using System.Collections.Generic;
 using System.Threading;
 using System.Threading.Tasks;
 

backend/src/Squidex/Areas/IdentityServer/Controllers/Error/ErrorController.cs

@@ -9,7 +9,6 @@ using System.Threading.Tasks;
 using IdentityServer4.Models;
 using IdentityServer4.Services;
 using Microsoft.AspNetCore.Diagnostics;
-using Microsoft.AspNetCore.Identity;
 using Microsoft.AspNetCore.Mvc;
 using Squidex.Infrastructure;
 

backend/src/Squidex/Areas/IdentityServer/Controllers/Setup/SetupController.cs

@@ -8,7 +8,6 @@
 using System;
 using System.Linq;
 using System.Threading.Tasks;
-using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Identity;
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.Extensions.Options;

backend/src/Squidex/Config/Web/WebServices.cs

@@ -17,7 +17,6 @@ using Squidex.Domain.Apps.Entities;
 using Squidex.Infrastructure.Caching;
 using Squidex.Infrastructure.Translations;
 using Squidex.Pipeline.Plugins;
-using Squidex.Pipeline.Robots;
 using Squidex.Shared;
 using Squidex.Web;
 using Squidex.Web.Pipeline;