Tesla Inc. (NASDAQ:TSLA) shares fell by about 2.7% in overnight trading on brokerage firm Robinhood after the company’s robotaxi unveiling event late on Thursday failed to give investors confidence. What Happened: Tesla on Thursday unveiled a two-seater Cybercab that can drive itself and a robovan with no pedals that can accommodate about 20 passengers at an event in Los Angeles on Thursday. The event, however, was thin on details with the company not divulging the cost of the robovan. Musk also said that the smaller Cybercab will join the company’s autonomous taxi fleet only by 2026. The CEO …