Remove TTS narration and improve BGM

src/main.ts

@@ -1,5 +1,5 @@
 import Phaser from 'phaser';
-import { musicTracks, voiceTracks } from './game/audio/audioAssets';
+import { musicTracks } from './game/audio/audioAssets';
 import { soundDirector } from './game/audio/SoundDirector';
 import { BattleScene } from './game/scenes/BattleScene';
 import { BootScene } from './game/scenes/BootScene';
@@ -27,7 +27,6 @@ const config: Phaser.Types.Core.GameConfig = {
 };
 
 soundDirector.registerMusicTracks(musicTracks);
-soundDirector.registerVoiceTracks(voiceTracks);
 
 const game = new Phaser.Game(config);