Don’t mock the beleaguered Nook owner. That could have been you. Five years ago, when the nation’s largest chain of bookstores released an e-reader that it promised would best Amazon’s Kindle, could you blame the poor souls who bought in to Barnes & Noble’s vision of the future? In 2011, Consumer Reports proclaimed the Nook the best e-reader in the land, saying it surpassed the Kindle in just abou