Introduction page for users without team

client/src/App.tsx

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

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

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

client/src/components/forms/TeamCreateForm/team-create.scss

client/src/components/helpers/ProtectedRoute.tsx

client/src/components/ui/Button/button.scss

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

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

client/src/components/ui/TextInput/text-input.scss

client/src/pages/Introduction/index.tsx

client/src/pages/Introduction/intro.scss