Bl express node example

[blittle]

WHY are these changes introduced?

This is an example setup where we have adapted the Remix Express starter app to use Hydrogen. A few things are not yet functional:

1. The app does not have a cache implementation. So sub-requests to the Storefront API won't be cachable.
2. The app does not yet utilize storefrontRedirect. This will be added when Remix releases middleware.
3. The app only includes a single index route. If you'd like to add more routes, run the Shopify CLI: npx shopify hydrogen generate route

Also I updated the CLI to allow the route generation to work in non-oxygen hydrogen apps.

[benjaminsehl]

This is awesome, Bret — thanks for doing this.

[benjaminsehl]

Suggested change

1. The app does not yet utilize [`storefrontRedirect`](https://shopify.dev/docs/api/hydrogen/2023-04/unstable/utilities/storefrontredirect). This will be added when Remix releases middleware.

1. Our [`storefrontRedirect`](https://shopify.dev/docs/api/hydrogen/2023-04/unstable/utilities/storefrontredirect) function, which handles redirects that are set in the Shopify Admin, must be set up in your server file. As the shape of the response isn't guaranteed, we haven't included this here. When Middleware is available in Remix, we'll add this into the example, until then, you can look to our [source code](https://github.com/Shopify/hydrogen/blob/2023-04/packages/hydrogen/src/routing/redirect.ts) to create your own implementation.

[frandiox]

Thanks Bret!

Just one thing, this example is missing .env so it doesn't work out of the box. You probably have it locally but it wasn't added to the PR. Can you force add it?