Clarify deletion policy and workflow

At KIT, there are currently five institutes that use the SMS. Across these five institutes, there have been several requests to delete devices, platforms, etc. where wrong information was stored or that never made it out of a "draft"-status. However, so far, only a single person is able to actually delete these entities. Therefore, it would be good to specify

a) a proper way of deleting entities (UI vs API)

b) who is able to delete entities (single instance admin vs. institute curators / admins, etc.)

As a side note: moving wrong / erroneous / incomplete entities to the archive is not the way how "our" users would like to tackle this issue. So I assume that we HAVE to come up with a more clear guideline / policy on how to do this.