Michigan president Santa Ono shared on social media Thursday that he and athletic director Warde Manuel are on the same page regarding keeping Jim Harbaugh as the head football coach, and then Harbaugh also posted a message saying he fully supports Ono’s message. But a source, who requested anonymity because they were not authorized to speak on the matter, indicated there is no contract offer yet from Michigan. “There’s nothing at all on the table, not even a napkin,” the source told The Detroit News. This swelling of positivity about Harbaugh remaining at his alma mater — presumably with a si…