ROCKVILLE, Maryland — Thirty years ago this summer, Dominique Dawes beamed atop an Olympic podium in Atlanta, clutching a bouquet and waving to the crowd that had packed inside the Georgia Dome. Minutes later, she placed a hand over her heart as the national anthem played. She was celebrating a first: The 19-year-old from Maryland had just helped the U.S. women’s gymnastics team to win a gold medal, a feat that had never been achieved before. D…