Remove unused middleware

LANCommander.Server/ApiMiddleware.cs

@@ -1,26 +0,0 @@
-using LANCommander.Server.Services;
-
-namespace LANCommander.Server
-{
-    public class ApiMiddleware
-    {
-        private readonly RequestDelegate Next;
-
-        public ApiMiddleware(RequestDelegate next)
-        {
-            Next = next;
-        }
-
-        public async Task InvokeAsync(HttpContext context)
-        {
-            context.Response.OnStarting(() =>
-            {
-                context.Response.Headers["X-API-Version"] = UpdateService.GetCurrentVersion().ToString();
-
-                return Task.CompletedTask;
-            });
-
-            await Next(context);
-        }
-    }
-}