refactor: Refactor views and components

src/components/Exceptions/NotFoundPage.vue

src/components/Exceptions/UnauthorizedPage.vue

src/components/Friends/UserFriends.vue

src/components/Leaderboard/LeaderboardRank.vue

src/components/Login/ChangePassword.vue

src/components/Login/ForgottenPassword.vue

src/components/Shop/ItemShop.vue

src/views/Authentication/ChangePasswordView.vue

src/views/Authentication/ForgottenPasswordView.vue

src/views/Authentication/LoginView.vue

src/views/Authentication/SignUpView.vue

src/views/Exception/NotFoundView.vue

src/views/Exception/UnauthorizedView.vue

src/views/Leaderboard/LeaderboardView.vue

src/views/Shop/ShopView.vue

src/views/User/UserFriendsView.vue