add parts data

web/src/layouts/MainLayout/MainLayout.js

@@ -0,0 +1,26 @@
+import { Link, routes } from '@redwoodjs/router'
+
+const MainLayout = ({ children }) => {
+  return (
+    <>
+      <header>
+        <nav>
+          <ul>
+            <li>
+              <Link to={routes.about()}>About</Link>
+            </li>
+            <li>
+              <Link to={routes.home()}>Home</Link>
+            </li>
+            <li>
+              <Link to={routes.parts()}>Parts</Link>
+            </li>
+          </ul>
+        </nav>
+      </header>
+      <main>{children}</main>
+    </>
+  )
+}
+
+export default MainLayout

web/src/layouts/MainLayout/MainLayout.stories.js

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+import MainLayout from './MainLayout'
+
+export const generated = () => {
+  return <MainLayout />
+}
+
+export default { title: 'Layouts/MainLayout' }

web/src/layouts/MainLayout/MainLayout.test.js

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+import { render } from '@redwoodjs/testing'
+
+import MainLayout from './MainLayout'
+
+describe('MainLayout', () => {
+  it('renders successfully', () => {
+    expect(() => {
+      render(<MainLayout />)
+    }).not.toThrow()
+  })
+})