fix: delete unused images

src/App.vue

src/assets/backgroundSavingsPath.png

src/assets/coffee.png

src/assets/finishLine.png

src/assets/flower.png

src/assets/frozenStreak.png

src/assets/gaming.png

src/assets/lock.png

src/assets/mat.png

src/assets/snacks.png

src/assets/start.png

src/assets/streak.png

src/assets/streakFlame.png