Make it easier to migrate between domains - export localhost to other domain name

[joepio]

We can simply rename JSON-AD strings when calling atomic-server export. Maybe add a flag --rename-domain. If this is done, Commits will no longer work because the signatures are now kaputt.

A very naive implementation is to replace all ${domain} occurences (e.g. http://localhost:9883) with ${newDomain} when exporting.

[joepio]

@turkhale

[turkhale]

Good, that's totally fine.