To build a website via Blowdown, an easy way is to let Netlify to build an initial website for you once you have GitHub account.
For example, if you use “Academic” theme, go to Install Academic with Netlify. Nelify will create a repository academic-kickstart (you can change the name) under your GitHub account and provide you with a customizable URL to access your new site.
On GitHub, go to your newly created repository and edit config.