No data on any visitors of this site is stored. On pages made by the owner of the site, no javascript or "cookies" are used and nothing more than the default nginx log files will be stored.
The nginx log files - for the uninitiated - contain information such as user agent and ip address. While not personally identifying on their own, these logs can be a privacy concern. Such logs will therefore be deleted after 7 days unless they are of particular interest (logs recording a ddos attack, for example). No information will ever be sold, given away or removed from the server hosting the site. This site does not block tor, so if a visitor does not believe the aforementioned claims they are free to obscure their ip address.