Remove unused helper
While looking at some Rubocop offenses in lib/helpers/child_parent_better.rb
, I saw in the history of the file that it seemed to be for breadcrumbs, which we no longer have.
I removed the helper and everything seems to still work perfectly locally. If we ever did re-implement breadcrumbs in the docs, I imagine it'd be re-written anyway.
So I think we should remove unused code.