By Chris Mannix Will we see a rematch between the two lightweights? That remains to be seen, but we will again see women’s boxing headline a top card. NEW YORK—Here are three takeaways from Katie Taylor’s historic split-decision win against Amanda Serrano on Saturday night at Madison Square Garden. What. A. Fight.The biggest fight in women’s boxing history lived up to the billing. Taylor, the undefeated and undisputed women’s lightweight champion, and Amanda Serrano packed MSG and delivered a performance for the ages. After going back-and-forth over the first three rounds, Serrano, the heavier…