Using git submodule is recommended instead of git clone as per recommendation from Netlify.
$ cd themes
$ git submodule add https://github.com/funkydan2/hugo-kiera.git kiera
For reference look inside folder exampleSite for content example and config.toml.
Important: don’t delete or move archetypes folder from root unless it is necessary. Current Hugo priority lookup will look into this folder first before any other archetypes folder and could cause problem.