Chloé Zhao’s “Nomadland,” a wistful portrait of itinerant lives on open roads across the American West, won best picture Sunday at the 93rd Academy Awards. The “Nomadland” victory capped the extraordinary rise of Zhao, a lyrical filmmaker whose winning film is just her third, and which—with a budget less than $5 million and featuring a cast populated by non-professional actors—ranks as one of the most modest-sized movies to win Hollywood’s top honor. (Zhao’s next film, Marvel’s “Eternals,” has a budget approximately 40 times that of “Nomadland.”) A plain-spoken meditation on solitude, grief, and grit, “Nomadland” stuck a chord in a pandemic-ravaged year. It made for an unlikely Oscar champ: A film about people who gravitate to the margins took center stage. “I have always found goodness in the people I’ve met everywhere I went in the world,” said Zhao when accepting best director, which Kathryn Bigelow (“The Hurt Locker”) was the only …