fix exercise solution links

[benpeloquin7]

@hawkrobe @ngoodman Exercise pages are linking to the conditioning exercises.

This has to do with default behavior in chapter layouts. Fix should just check if .md file is a chapter or exercise.

[hawkrobe]

Hmmm, just tested locally and this had the peculiar property of linking all the exercises not the next chapter but to a hidden chapter on non-parametric models. I think the issue is that you're not checking whether the current file is chapter or exercise, but checking whether the next one is?

[benpeloquin7]

@hawkrobe weird - how are you testing locally?

[hawkrobe]

the probmods readme here is all about setting up for testing locally!

[benpeloquin7]

great, thanks. that'll make it much more straightforward ;)

[benpeloquin7]

@hawkrobe, @ngoodman I've just removed the Next Chapter link from exercises which seems fine to me. It's not going to make navigating to the next chapter any harder. Looks fine when I test locally.

[hawkrobe]

sounds like a great solution to me!