Restricts Xenomicrobes to admin only and trader shuttle, yes the funny become a biohazard instant reagent (#21506)

* removes all mention of xeno microbes from the code

* xenomicrobes are now just bus

* Update disease.dm

* bro hit me with a 🤨

* Update debris3.dmm

* returns it back to the rare meds list (i thought this was a pill list that spawned it)

code/modules/reagents/chemistry/reagents/disease.dm

@@ -14,7 +14,6 @@
 				new/obj/item/organ/internal/body_egg/spider_eggs(M) //Yes, even Xenos can fall victim to the plague that is spider infestation.
 	return ..()
 
-
 /datum/reagent/nanomachines
 	name = "Nanomachines"
 	id = "nanomachines"
@@ -28,7 +27,6 @@
 		M.ForceContractDisease(new /datum/disease/transformation/robot(0))
 	return ..()
 
-
 /datum/reagent/xenomicrobes
 	name = "Xenomicrobes"
 	id = "xenomicrobes"