Improve search functions on MDD species pages

[n8upham]

@jhpoelen can you think of ways in which we could improve our current filter-based search at mammaldiversity.org? I've been discussing with @liphardt but no easy solutions emerged

Some fields of the JSON endpoint we'd like to be able to search include:

• country
• species status (synonym, extinct, extant, domestic)
• common names
• e.g., from recent feedback: "if enter the keyword "United States" in the search bar, I would get the list of all American mammals. Or again, if I put the option "Recently extinct", I have the list of all extinct species. Or else, if I enter "Reindeer" in the search bar, I don't get the species sheet."

[jhpoelen]

One way to help support this search functionality is to pre-render json files( using some jekyll template) that are organized by key-value - where key is the search term and value is a list of search results (or ids that point to same result).

Each of the search terms would have their own dedicated json file e.g., index-country.json, index-status.json, index-common-names.json

Then, in the search tool, the various indexes can be used to help narrow down the search results given the user's interest.

Curious to hear your thoughts!

[jhpoelen]

related to #44