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.tsx

@@ -0,0 +1,13 @@
+import type { Route } from './+types/home'
+import { Welcome } from '../welcome/welcome'
+
+export function meta(_: Route.MetaArgs) {
+  return [
+    { title: 'New React Router App' },
+    { name: 'description', content: 'Welcome to React Router!' },
+  ]
+}
+
+export default function Home() {
+  return <Welcome />
+}