Build Ventures is entering Newfoundland and Labrador with a major investment, supporting Celtx — a startup whose software is being adopted by companies in film, video and theatre around the world. With CEO Mark Kennedy at the helm, the St. John’s-based company began 15 years ago with the simple idea of taking a range of film production processes—from script writing, to production notes and set designs—and moving them from paper to digital. “This is a tremendous opportunity,” says Kennedy. “We’re reinventing how an industry does its work, and it’s a global business. We make 95 percent of our money outside…