♻️ refactor(App): use react router

this adds `MainPage`

src/components/pages/MainPage/MainPage.css

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+#root {
+  max-width: 1280px;
+  margin: 0 auto;
+  padding: 2rem;
+  text-align: center;
+}
+
+.logo {
+  height: 6em;
+  padding: 1.5em;
+  will-change: filter;
+  transition: filter 300ms;
+}
+.logo:hover {
+  filter: drop-shadow(0 0 2em #646cffaa);
+}
+.logo.react:hover {
+  filter: drop-shadow(0 0 2em #61dafbaa);
+}
+
+@keyframes logo-spin {
+  from {
+    transform: rotate(0deg);
+  }
+  to {
+    transform: rotate(360deg);
+  }
+}
+
+@media (prefers-reduced-motion: no-preference) {
+  a:nth-of-type(2) .logo {
+    animation: logo-spin infinite 20s linear;
+  }
+}
+
+.card {
+  padding: 2em;
+}
+
+.read-the-docs {
+  color: #888;
+}

src/components/pages/MainPage/MainPage.test.tsx

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+import { describe, it, expect, afterEach } from 'vitest'
+import { render, screen, cleanup } from '@testing-library/react'
+import userEvent from '@testing-library/user-event'
+
+import MainPage from './MainPage'
+
+// Tests
+describe('Renders main page correctly', async () => {
+  /**
+   * Resets all renders after each test
+   */
+  afterEach(() => {
+    cleanup()
+  })
+
+  /**
+   * Passes - shows title correctly
+   */
+  it('Should render the page correctly', async () => {
+    // Setup
+    await render(<MainPage />)
+    const h1 = await screen.queryByText('Vite + React')
+
+    // Post Expectations
+    expect(h1).toBeInTheDocument()
+  })
+
+  /**
+   * Passes - shows the button count correctly present
+   */
+  it('Should show the button count set to 0', async () => {
+    // Setup
+    await render(<MainPage />)
+    const button = await screen.queryByText('count is 0')
+
+    // Expectations
+    expect(button).toBeInTheDocument()
+  })
+
+  /**
+   * Passes - clicks the button 3 times and shows the correct count
+   */
+  it('Should show the button count set to 3', async () => {
+    // Setup
+    const user = userEvent.setup()
+    await render(<MainPage />)
+    const button = await screen.queryByText('count is 0')
+
+    // Pre Expectations
+    expect(button).toBeInTheDocument()
+
+    // Actions
+    await user.click(button as HTMLElement)
+    await user.click(button as HTMLElement)
+    await user.click(button as HTMLElement)
+
+    // Post Expectations
+    expect(button?.innerHTML).toBe('count is 3')
+  })
+})

src/components/pages/MainPage/MainPage.tsx

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+import { useState } from 'react'
+import reactLogo from 'assets/react.svg'
+import viteLogo from '/vite.svg'
+import './MainPage.css'
+
+function MainPage() {
+  const [count, setCount] = useState(0)
+
+  return (
+    <>
+      <div>
+        <a href="https://vitejs.dev" target="_blank">
+          <img src={viteLogo} className="logo" alt="Vite logo" />
+        </a>
+        <a href="https://react.dev" target="_blank">
+          <img src={reactLogo} className="logo react" alt="React logo" />
+        </a>
+      </div>
+      <h1>Vite + React</h1>
+      <div className="card">
+        <button onClick={() => setCount(count => count + 1)}>count is {count}</button>
+        <p>
+          Edit <code>src/App.tsx</code> and save to test HMR
+        </p>
+      </div>
+      <p className="read-the-docs">Click on the Vite and React logos to learn more</p>
+    </>
+  )
+}
+
+export default MainPage

src/components/pages/MainPage/index.ts

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+export { default } from './MainPage'

src/components/pages/index.ts

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+export { default as MainPage } from './MainPage'