Rename all files in data/pokedex/entries/

Some people suggested this would be a good idea, and make management of
the files easier. I'm inclined to agree.

data/pokedex/entries/snorlax.asm

@@ -0,0 +1,10 @@
+; SnorlaxPokedexEntry: ; 0x1cc5cf
+	db "SLEEPING@" ; species name
+	dw 611, 10140 ; height, weight
+
+	db   "This #MON's"
+	next "stomach is so"
+	next "strong, even"
+	page "eating moldy or"
+	next "rotten food will"
+	next "not affect it.@"