Delete useless links

[david-venhoff]

Motivation

Right now we keep links for translations which are outdated or archived in the database. However, there is no reason to do so. We have a lot of link objects in the database, and removing unused links will be a nice performance improvement. If we can rely on only useful links existing, we could also simplify some database queries.

Proposed Solution

Remove all links for content objects which are archived or outdated (There may be more cases where we don't want to have links)

Alternatives

Do nothing

Additional Context

https://chat.tuerantuer.org/digitalfabrik/pl/ykbppm73hi8pim98khpgja6z9h