LOLA: Add a section: how to copy from outbox to handle unaugmented source servers

[lisad]

Even if we prefer to copy from a list of content objects other than the outbox, it would be good to explain how a destination server ought to copy from the outbox of a server that doesn't support LOLA, because there are surely good ways and less good ways to do this. The section would likely be non-normative.

A source server with an ActivityPub outbox that doesn't technically support LOLA could still offer affordances to assist in a move going smoothly, especially the UX options for setting up redirects and notifying followers.

This was suggested by @evanp in the SWICG call May 3, 2024.