Good Omens covers update

[aletheiafelinea]

The entry in question had had been updated a few times, which I hadn't really announced before, but this time the direct cause was fixing the code after the DW migration, which made an opportunity to account for the worldwide surge of new editions after the BBC show, and that's how the final result is now a major overhaul rather than just update. If anyone is interested, have fun!

Also, a remider that the code now has been optimized for the Dreamwidth entry, though the LJ one has been remade as well.