This is an Archetect catalog containing archetypes for starting new archetypes.
Yes, there's a bit of Inception going on here. Instead of creating new archetypes from scratch/by hand, simply use Archetect itself to generate the scaffolding for your new archetype.
To render an archetype from this catalog, use the following command:
archetect catalog https://github.com/archetect/archetype-starters.catalog.git