The manpages.d.o site is currently offline since April 2016 as there were scalibility issues with the service.
There are three known implementations of "man to web" archive generators.
The current codebase is a set of Perl and bash CGI scripts that dynamically generate (and search through) manpages.
A new codebase written by dgilman is available in github. It is a simple Python script with a sqlite backend.