Amazon announced on Thursday that it narrowed its list of potential cities for its second headquarters to 20. It's bad news for the Bay Area, which is nowwhere on the list. The Seattle-based tech giant said it reviewed 238 proposals from across the U.S., Canada, and Mexico to host its so-called HQ2, the company's second headquarters in North America. Among those proposals was San Jose, which last year submitted a lengthy pitch to land the headquarters, which would bring up to 50,000 jobs with…