This website is a single HTML file. It simply uses the #anchor suffix (from 1992) and the :target CSS selector to show and hide pages/content. This setup is databaseless, javascriptless, and buildshit-free, so you can edit your website with a text editor and upload it somewhere like a normal person.
S. Ostojic, B. Nienhuis, E. Somfai, and T. Vlugt. Abstract Book of the XXIII IUPAP International Conference on Statistical Physics, Genova, Italy, (9-13 July 2007)