I'm preparing for a migration of Magento to 2.0 with a massive Web store. Since this will take a few hours to complete, I need to shut down access to the current store across the entire account, while still allowing myself access to the URL. We don't want customers to see a suspension screen or anything like that, so need to come up with a way to redirect all traffic to a construction page (which we can host on another account). Not finding any way to do this right now, though. Thoughts?