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/dodrio.asm

@@ -0,0 +1,10 @@
+; DodrioPokedexEntry: ; 0x1b884a
+	db "TRIPLEBIRD@" ; species name
+	dw 511, 1880 ; height, weight
+
+	db   "An enemy that"
+	next "takes its eyes off"
+	next "any of the three"
+	page "heads--even for a"
+	next "second--will get"
+	next "pecked severely.@"