Sunset Squares Pizza has fewer than 1,000 followers on Instagram. Delivery in its neighborhood — San Francisco’s Sunset district — costs $5, while those farther afield in the city pay $10. There’s a handful of pizzas and nondairy focaccia options on the menu, a couple salads, and a dessert. The dough is made from sourdough and a wild yeast starter, and the pies are, of course, square. What started as a pandemic-era baking project between a father and his teen