search: remove google functionality, alias .g to .ddg
search: remove google functionality, alias .g to .ddg

Google removed their deprecated API we used for searching.
Since their new API requires API keys (and sometimes money), it's
simply not worth the hassle to support. Duck Duck Go should be good
enough.

This fixes issue #650, in a way.

Uname-a/knife_scraper,Uname-a/knife_scraper,Uname-a/knife_scraper