Remove out of date stuff from README
Remove out of date stuff from README

+ We're beyond the pilot school now, and we're at all elementary schools in Somerville so that school chart is kind of useless

studentinsights/studentinsights,studentinsights/studentinsights,jhilde/studentinsights,studentinsights/studentinsights,jhilde/studentinsights,jhilde/studentinsights,studentinsights/studentinsights,jhilde/studentinsights