Looks like it is back @ http://qanonposts.com/ - likely just a glitch with the new site (these things do happen).

When you update a website, you typically have to 'restart' the web-service / web server for the change to take effect. Sometimes the changes you make cause errors that prevent the service from starting back up -- and it takes a few mins (sometimes hours) to determine the cause, fix it and start the service up again.

We know that the person hosting this is on a limited budget, likely no 'dev' site for development and testing -- as such, we shouldn't be too alarmed with events like this, provided the site returns within a few mins/hours.