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/hitmonlee.asm

@@ -0,0 +1,10 @@
+; HitmonleePokedexEntry: ; 0x1b913f
+	db "KICKING@" ; species name
+	dw 411, 1100 ; height, weight
+
+	db   "It is also called"
+	next "the Kick Master."
+	next "It uses its"
+	page "elastic legs to"
+	next "execute every"
+	next "known kick.@"