Parse markdown for facet/search results

[wkdewey]

Related to #280. We could have every facet results be run through the markdown parsing code. If it matches a markdown pattern, then show the title only. This is what I did here: CDRH/african_poetics#304.

[techgique]

Closed an older PR as it appeared to no longer be compatible with dev and recent accessibility work. Older duplicate issue also closed.

If we revisit this, we'll want @erinchambers to be involved so accessibility is considered. Also want to be careful it doesn't change content on existing sites unintentionally.