Create your space with simplicity, tranquility, and beautifully minimalist style. The yearning for a life of pared-down purity has built to a roar, and Serena Mitnik-Miller and Mason St. Peter—the husband-and-wife owners of General Store, one of California's most talked-about shops—are at the forefront. In Abode: Thoughtful Living with Less, these tastemakers make a graceful case for livi…