this link here promises a react based web-app sample, but then it says "You need to get you setup so you can build, launch, and play with your app. These instru

this link here promises a react based web-app sample, but then it says "You need to get you setup so you can build, launch, and play with your app. These instructions are written for macOS, the only system you can develop iOS apps on." It then proceeds to provide instructions only for mac os. How come? Why does one need mac os to run a web application? https://github.com/lobe/web-bootstrap https://github.com/lobe/web-bootstrap