Consolidate examples

[blaine-arcjet]

Create one example for Next 13 and one for Next 14 that don't have default files.

Yeh I've been thinking about this. I've copied the idea from how Next.js does it at https://github.com/vercel/next.js/tree/canary/examples - they have more lightweight examples without the default files e.g. images, CSS, etc, so I'd like to do that. We should probably have just a single example app for each major version and also merge in app / pages dirs as well. Then we can more easily manage the ignore list.

Originally posted by @davidmytton in https://github.com/arcjet/arcjet-js/issues/62#issuecomment-1857827037