Created by: clottman
Updates the build/run scripts in package.json to use the recommendednpx @11ty/eleventy instead of just npx eleventy.
This is important because of an issue where if you run npx eleventy and don't already have Eleventy installed either locally or globally on your system, you'll fetch and run the package eleventy from npm which is not @11ty/eleventy, the static site generator.
See this issue in the 11ty website docs and my twitter thread for more details on what can happen.