ChaCha Search Inc., the human-powered search engine started by local tech guru Scott Jones, shut down operations Monday. The decade-old Carmel-based company, which once employed more than 100 people, had been operating with a skeleton crew of roughly a dozen since about summer 2014. When it switched from a physical office to a virtual office in mid-2015, its goal had been to generate profits, pay down creditors and hopefully, find a buyer, Jones said. But advertising revenue declined sharply this year, leaving the company unable . . .