STAR CORRESPONDENT Football is back, and there may not be a better way to open the 2026 season in Northeast Tennessee than with an old rivalry. When Elizabethton welcomes Science Hill to Citizens Bank Stadium at 7:30 p.m. Friday, the contest will once again be about much more than the final score. The two neighboring communities have built a rivalry in which nobody wants to lose — whether the competition is on the football field, basketball cour…