[React Router Layouts] Components for the routes

Components.js

import React from 'react';

const One = () => <h1>Content of page one</h1>;
const Two = () => <h1>Content of page two</h1>;
const Three = () => <h1>Content of page three</h1>;
const Four = () => <h1>Content of page four</h1>;

export { One, Two, Three, Four };