As thousands of Chicago Public Schools families scrambled to find transportation to the first day of school Monday because of a mass bus driver resignation that officials attributed to anger over a vaccine mandate, Mayor Lori Lightfoot said her administration is in talks with rideshare companies to take children to their schools. The move would be highly unusual and could cause yet another set of dilemmas to sort through as parents figure out how to get their kids to classes. About 2,100 students, including 990 in special education, were given no more than two days’ notice that their bus route...