If you heard something peppy along Water Street Sunday there’s a reason. The Convention Center was filled with cheerleaders. The Mobile Convention Center was rocking Sunday as cheerleading teams from across the Gulf Coast competed in this year’s Jamfest Nationals competition. 90 teams from four states converged on the Port City today to show their stuff.   There were about 2,000 people packed inside today. Jamfest is one of the largest and most well-known cheer and dance companies in the country. Organizers say the competition is fierce. Teams from Mobile, Pensacola, and Ocean…