Gutes Guterman sat on an antique French farm bench in Pig Bar, a craft beer shop overlooking the scene-y slice of Lower Manhattan known as Dimes Square. Reaching for a gherkin, her hand in a lacy fingerless glove, she paused to gesture toward the former site of the Drunken Canal newspaper box. “If you know, you know,” she said. It was a cool spring day, and Ms. Guterman, 26, was here to talk about her latest editorial venture: Byline, a website that went live on Thursday.