We add ?as=s&s=<query> to articles when followed from search results. We should also add the rank of the result clicked, e.g. ?as=s&s=<query>&r=11 for the eleventh result (first of page 2).
https://github.com/jsocol/kitsune/compare/555381c...8766cdf This ended up zero-index instead of 1-indexed. That's fine. First result has r=0, second has r=1, first on second page has r=10, etc.
Verified search results have ranking, starting with zero