Make a gift in honor of the good that comes from BDN journalism in your hands, and help raise $60,000 this spring to support our reporting. Make a donation now. A graduate of George Stevens Academy with more than two decades of education experience will be the next leader of the Blue Hill school. Shelly Schildroth, most recently the curriculum director for Sullivan-based RSU 24, starts July 1, the school announced Wednesday. She follows Dan Wel…