jetbrains.aqua / jetbrains.writerside: Remove

These two IDEs are discontinued and should be removed from nixpkgs.


On a related note, PyCharm Professional and Community are also discontinued, they are replaced by PyCharm, but the state of the OSS project is currently uncertain, see https://github.com/NixOS/nixpkgs/pull/412971