Create directory structure for frontend with requisite justfile changes. (#6)

Reviewed-on: #6
Co-authored-by: Drew Galbraith <drew@tiramisu.one>
Co-committed-by: Drew Galbraith <drew@tiramisu.one>

frontend/app/routes/home.test.tsx

@@ -0,0 +1,10 @@
+import { render, screen } from '@testing-library/react'
+import { describe, it, expect } from 'vitest'
+import Home from './home'
+
+describe('Home component', () => {
+  it('should render welcome component', () => {
+    render(<Home />)
+    expect(screen.getByText(/React Router/i)).toBeInTheDocument()
+  })
+})