Updated CLI demo videos for docs and dev quickstart

docs quickstart https://docs.lightdash.com/get-started/develop-in-lightdash/intro
notion quickstart with videos https://lightdash.notion.site/Lightdash-developer-quickstart-3192f80173ef4f0bbbe0f0f88b726a76

these should mirror each other and the notion version is mainly for customizing for specific customers or letting them share internally easier 