@zamiang => Documented the search API.

Documented the new search API.

I decided not to expose any special query parameters for filtering and just let the clients specify that. So if someone wants to search for artists only, they can add `more:pagemap:metatags-og_type:artist` to the search query themselves. There're too many combinations of things possible with Google Custom Search, I feel like we're not adding any value by wrapping it up.