Fixes for MVP

[sonumodi66]

1. Instead of heading of story in the story scene, replace it with story name.
2. There should be an option to exist from the game, at first scene.
3. For the intro scene, player can press back button twice to quit the game.
4. Same thing for the instruction scene as well as in Menu scene as in 3.
5. Update the UI placement & arrangement of story scene.
6. Put three dots clickable option for players, when they click it, a pop-up will come over, and there would be the options of a. Continue game b. Quit game c. Toggle SFX d. Question marked button for tutorial (or Tool tip)

[Treslina]

@sonumodi66 Please update the status of this task