Full starters already do auth + billing. What I kept rebuilding was the marketing spine: titles, sitemap, JSON-LD, OG, plus /alternatives /compare /industries.
So I shipped a Next.js kit that reads one business.yaml and regenerates those pages with the site. $39, one-time, you own the code, open it in Cursor.
Not competing with ShipFast. They price 2 hours of tags. This is the alternatives hub.
Want a teardown of the yaml → routes if useful.