Host our own copy of Freebase Suggest documentation

OpenRefine relies on a modified version of the Freebase Suggest widget for looking up reconciliation candidate entities. The code includes no documentation, relying instead on an external web page for documentation, but that's at risk of going away since Google deprecated the code many years ago.

We should either include documentation inline of the options, css, and events or host the documentation in a separate file or on our wiki.

https://developers.google.com/freebase/v1/search-widget#configuration-options
https://developers.google.com/freebase/v1/search-widget#modifying-the-css
https://developers.google.com/freebase/v1/search-widget#how-events-work

We should add to this documentation, the new access option we added, which controls the dataType used for AJAX requests (jsonp (default) or json).

Here are some Wayback Machine links so that we can find them easily in the future:
https://web.archive.org/web/20121116225226/http://wiki.freebase.com/wiki/Freebase_Suggest_Recipes
https://web.archive.org/web/20150909024102/https://developers.google.com/freebase/v1/search-metaschema
https://developers.google.com/freebase/v1/search-overview

Start with the linked Google and Wayback Machine pages, then inspect OpenRefine's modified Freebase Suggest widget to locate the relevant documentation context. Document the options, CSS customization, events, and the added access option, using either an inline section, a separate file, or the wiki.