Allow redirection of links to lists

Email lists sometimes need to be renamed.

This does not affect Permalinks to individual emails, however it does affect links to lists themselves.

domains are sometimes renamed, and sometimes lists are renamed or moved to another project.

It would be useful to be able to continue to support the old list links, i.e.

list.html?old-domain => list.html?new-domain
list.html?old-listname@domain => list.html?new-listname@domain
list.html?old-listname@old-domain => list.html?new-listname@new-domain

A further enhancement would be to show the original domains on the top-level pages, and further to show individual lists on the domain pages.
i.e. old-domain should still appear on the top-level pages, and old-listname should appear on the domain page where it was originally

Start by locating the entry point that handles list.html links and the code rendering top-level and domain pages. Trace how domains and list names are resolved, then verify that each old URL form reaches its replacement and that original domains and list names remain visible where requested.

Written by the indexing model from the issue text.