Nypost: City Hall’s bumbling tech czar previously held a similar job in Atlanta — which was crippled by a cyberattack shortly after he left for the Big Apple. Samir Saini, who’s enmeshed in a scandal over an entirely preventable crash of the city’s in-house wireless network, was Atlanta’s chief information officer when Mayor Bill de Blasio named him head of the Department of Information Technology and Telecommunications in January 2018...