Start intro_credits_graphics decomp

ld_script.txt

@@ -232,6 +232,7 @@ SECTIONS {
         src/braille_puzzles.o(.text);
         src/pokeblock_feed.o(.text);
         src/clear_save_data_screen.o(.text);
+        src/intro_credits_graphics.o(.text);
         asm/intro_credits_graphics.o(.text);
         src/evolution_graphics.o(.text);
         src/bard_music.o(.text);