Adds JetBrains.Annotations to reduce amount of false positives by static code analysis

src/Web/DependencyInjection.cs

@@ -2,6 +2,7 @@
 using Azure.Identity;
 using Hutopy.Application.Common.Interfaces;
 using Hutopy.Infrastructure.Data;
+using Hutopy.Web.Infrastructure;
 using Hutopy.Web.Services;
 using Microsoft.AspNetCore.Authentication.Cookies;
 using Microsoft.AspNetCore.Authentication.Facebook;