Icon folder cleaning wave one (#76703)

## About The Pull Request

Due to a mental breakdown caused by unfathomable abomination that is
icons folder, I swore to myself to one day clean it. Today is kind of
that day. Been at it for around 6, you gotta understand I need a rest. I
tracked most changes in descriptions of commits if you are looking for
details.

## Why It's Good For The Game

Saner spriters make better sprites. And also, just helps keep track of
things.

## Changelog

🆑
image: added sprites for different variants of scrolls.
image: modified couple posters with ghost pixels.
/🆑

---------

Co-authored-by: OrionTheFox <76465278+OrionTheFox@users.noreply.github.com>

code/modules/mob_spawn/ghost_roles/golem_roles.dm

@@ -5,7 +5,7 @@
 /obj/effect/mob_spawn/ghost_role/human/golem
 	name = "inert free golem shell"
 	desc = "A humanoid shape, empty, lifeless, and full of potential."
-	icon = 'icons/obj/wizard.dmi'
+	icon = 'icons/mob/shells.dmi'
 	icon_state = "shell_complete"
 	mob_species = /datum/species/golem
 	anchored = FALSE