chore: rename home route file to _layout._index.tsx and update type import

app/routes/_layout._index.tsx

@@ -0,0 +1,14 @@
+import { Welcome } from '~/layouts/home/welcome'
+
+import type { Route } from './+types/_layout._index'
+
+export function meta({}: Route.MetaArgs) {
+  return [
+    { title: 'New React Router App' },
+    { name: 'description', content: 'Welcome to React Router!' },
+  ]
+}
+
+export default function Home() {
+  return <Welcome />
+}