Pagefind sub-results ranking

[cgettings]

pagefind's default behavior when showing sub-results seems to be: show the first 3 sub-results, implicitly ranked by the order in which they appear on the page.

So, the search term "smoke asthma" returns

because of this

even though "Mold in homes" has one hit with a score of 39574, and "Secondhand smoke at home" has 3 hits with scores of 69456, 51029, and 51029.

Each result contains all matching sub-results, so we could figure out how to overwrite the displayed sub-results with an arbitrary number sorted by balanced_score.

Would be moot if the pagefind team changes the default behavior, and I might submit an issue over there.

[mmontesanonyc]

A few other enhancements:

NB: a lot of our site-search terms are for neighborhoods - neighborhood names, including ZIP Codes. Search should absolutely return useful results for neighborhood names, ZIPs, etc.

• Write readme/documentation covering tags to use, weighting standards, links to useful documentation (eg HX -> weight equivalence)
• Revise Key Topic title weighting
• Ensure good data-features weighting
• Add ZIPs to NR weighting
• "Get data for TITLE about NEIGHBORHOOD" on data-explorer/single.html or section.html with low weight so that a neighborhood search turns up Data Explorer opportunities.

CC @cgettings