chore(tutorials/jokes): prefetch new page

[MichaelDeBoey]

Fixes #961

[ryanflorence]

@kentcdodds you want this in the tutorial? If so go ahead and merge :)

[kentcdodds]

Yeah, this is probably a good idea 👍

[kentcdodds]

Actually, in all cases, these code blocks come before we add JS to the page so it won't do anything. There's a section in the tutorial where I describe prefetching and I suppose we could mention you could add it to the new link and even add a code block there if you'd like: https://remix.run/docs/en/v1/tutorials/jokes#prefetching

[ryanflorence]

Ah yeah, it introduces the concept already, so I think we're good.