[PRQ#40590] Deletion Request for chestnut

Giasko [1] filed a deletion request for chestnut [2]: The project does not exist anymore on GitHub, same thing for chestnut- git. mediahandling and mediahandling-git should be deleted too since they are only needed for chestnut. [1] https://aur.archlinux.org/account/Giasko/ [2] https://aur.archlinux.org/pkgbase/chestnut/