Merge branch 'refactor/21/clean-up-sparesti' into 'dev'

src/App.vue

src/assets/base.css

src/assets/main.css

src/assets/sti.png

src/components/ButtonAddGoalOrChallenge.vue

src/components/ButtonDisplayStreak.vue

src/components/CardChallenge.vue

src/components/CardChallengeSavingsPath.vue

src/components/CardGoal.vue

src/components/FormLogin.vue

src/components/FormRegister.vue

src/components/ImgGifTemplate.vue

src/components/ModalComponent.vue

src/components/NavBarComponent.vue

src/components/PageControl.vue

src/components/ProgressBar.vue

src/components/SavingsPath.vue

src/components/__tests__/savingsPathTest.spec.ts

src/stores/challengeStore.ts

src/stores/goalStore.ts