The site links to a site that accepts payment data. So because the author’s site is http, a MITM attacker could change the payment links from lulu.com to site-that-actually-steals-your-credit-card.com.
That’s one huge thing https provides over http… assurance of unadulterated content, including links to sites that actually deal in sensitive data.
I use Ansible to meet this need. Whenever I want to deploy to one or more remote hosts, I run Ansible locally and it connects via SSH to the remote host(s). There, it can run Docker Compose, configure services, lay down files on the host, restart things, etc.