If Dolly Parton’s death has left you crying at a song you’ve heard a hundred times, texting the person who first played her music for you, or simply feeling more wrecked than you expected, you are part of a major global movement. Social media is full of people — including celebrities like her goddaughter, Miley Cyrus, as well as millions of fans who never met her — sharing their deep sadness at her passing. Parton, who died August 25 at age 80, …