public async Task <IActionResult> RemoveFiles([FromRoute] long id)
{
var certificate = await _context.UserCertificates
.Include(x => x.File)
.SingleOrDefaultAsync(x => x.Id == id);
_fileWorker.RemoveFile(certificate.File.Path);
_context.FileDescriptions.Remove(certificate.File);
await _context.SaveChangesAsync();
return(Ok());
}