Heather Donahue once graced the cover of Newsweek and bantered with Jon Stewart. She was arguably, for a brief time, the face of one of cinema’s most groundbreaking films, putting an entirely new spin on the term “close-up.” Today, she’s just as fulfilled strolling down Broad Street with her dog, Vito, and grabbing a slice of pizza at Pete’s. Most people, outside of Nevada City, know her from her hair-raising turn playing herself in “ The Blair Witch Project.” Others, most recently and locally, know her as the woman behind the memoir “Growgirl,” the story of her departure from Hollywood …