Implement random publication order/sampling through typesense query

[kevinstadler]

The current implementation of random ordering/sampling of publications (on the landing page as well as the 'more in [language]' section of the publication details page) is a terrible work-around, because the current version of Typesense does not support random ordering. v28 will include a new built-in random sorting feature, already available as RCs, and a production-ready version will hopefully come out in October, so that the ACDH server can be updated to v28.