Fixed more small issues

client/src/components/forms/LoginForm/index.tsx

client/src/components/forms/RegisterForm/index.tsx

client/src/components/forms/RoleForm/role-form.scss

client/src/components/graphs/BarChart/bar-chart.scss

client/src/components/navigation/Header/index.tsx

client/src/components/navigation/Navigation/navigation.scss

client/src/components/navigation/Sidebar/sidebar.scss

client/src/components/ui/Avatar/avatar.scss

client/src/components/ui/Avatar/index.tsx

client/src/components/ui/LoadingScreen/index.tsx

client/src/components/ui/LoadingScreen/loading-screen.scss

client/src/components/ui/Popup/popup.scss

client/src/config.ts

client/src/pages/Login/index.tsx

client/src/pages/Register/index.tsx