redirect npmjs.org/?searchTerm -> npmjs.org/search?searchTerm
redirect npmjs.org/?searchTerm -> npmjs.org/search?searchTerm

Per https://twitter.com/_jden/status/329027361716723712, redirect empty path with qs
to search route, especially for use when manually typing urls with npm.im.

sundayliu/npm-www,maxogden/npm-www,sundayliu/npm-www,maxogden/npm-www,sundayliu/npm-www