Collapse children in feature page sidebar menu on smaller viewports

[ggeisler]

A recent Stanford exhibit has a feature page category with 65 child pages in it. On smaller viewports where the feature page content is rendered below (instead of next to) the sidebar menu, users have to do a lot of scrolling before they reach the current page content (in the screenshot below, there is still more than half the list of child pages under the "65 Stories" link to scroll past before getting to the page content):

Although this is an extreme example, Stanford does have other exhibits with a dozen or more child pages that result in a similar problem, and this could potentially occur with any Spotlight implementation.

Perhaps we should add a Bootstrap collapse to the parent page element (if it has one or more child pages) at viewports below lg so that the child page links are hidden until the parent page link is selected, after which the child page list is expanded:

Collapse added to parent page links

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Parent page link expanded to reveal child page list