Reddit co-founder Alexis Ohanian announced his resignation from the board of the social media site and urged the board to replace him with a black candidate. Ohanian, who is white, implicitly linked his move to protests around the globe over the killing of George Floyd, a black man who died in Minneapolis after a police officer pressed his knee against his neck for several minutes, even after he stopped pleading for air and became unresponsive. The entrepreneur, who is married to tennis star Serena Williams, said he made the decision for the sake of his daughter.”I’m writing this as a father who needs to be able to answer his black daughter when she asks: “What did you do?,” Ohanian said in a blog post. He pledged to use future gains on his Reddit stock to “serve the black community, chiefly to curb racial hate.” He also said he would give …