Usually more about the technology behind it than about the site itself. eg: I consider this a colophon https://world-playground-deceit.net/about/website.html ...and this recent link through n.y.c came through when I searched as having a "Colophon" for the project: https://ratfactor.com/snobol/
...the wiki link talks a little bit about "website colophons" as well.
For a website, how does a Colophon page differ from an “About” page?