Skip Oxygen checks when @shopify/remix-oxygen is not installed

[frandiox]

Related to #1122

This PR skips Oxygen requirements we had for the config when not deploying to Oxygen.

I've also renamed config.ts to remix-config.ts to make it more obvious since we have another file called shopify-config.ts.

[ascorbic]

@frandiox Hey. I'm updating our template and it looks like these checks are still being triggered when @shopify/remix-oxygen is not installed, because @shopify/remix-oxygen is also a dependency of @shopify/cli-hydrogen. Would it be possible to instead check if @shopify/remix-oxygen is in the package.json, so it only triggers for explicitly-installed packages?

[frandiox]

Hi! Forgot to reply earlier today but here's a PR that removes @shopify/remix-oxygen from our peer deps. I think it was a mistake to add it as a peer dep in the first place. This should fix your issue. If it doesn't then I'll change it to check package.json instead 👍

Edit: @ascorbic You can try with @shopify/cli-hydrogen@0.0.0-next-8fce70d-20231107025821 to test but I think it should work. Now we only have the root project depending on the Oxygen adapter (direct dependency):