Layout Cookbook - Breadcrumb example with clear intent

[alejalapeno]

Setting the pseudo-class selector :not() paired with :first-child removes the need for separate CSS rules to achieve the same effect, but also makes your codes intent clearer by stating you want to select all list items that are not the first child.

[rachelandrew]

This was actually a choice made to simplify the example (in teaching I find a lot of people have little to no exposure to any complex selectors, and we're concentrating on layout here). I could go either way on it though.

[chrisdavidmills]

I think it's good to keep examples simple, to maximize the number of people who will understand them. But I also think it's probably worth adding a note to the article to state that this is an efficiency change you could make if you were looking for optimization.

@alejalapeno, do you fancy making this change?

[avivmu]

I updated the relevant docs - see revision change.
@chrisdavidmills If looks okay, can close this PR

[chrisdavidmills]

Thanks @avivmu ; I've made some small updates, but this is looking good.