To be clear, this creates a separate Pixelfed account, it just uses your Mastodon info for quick profile setup and authentication.

Document document document.

Also, the nice thing about libraries, frameworks, and CMSs is that they already have documentation. If it seems like a pain to learn one of those, imagine how much worse it would be for someone to learn custom code that doesn’t have any resources on Google.

docker-compose gives host names to everything, so you can just use those. If it’s local, then whoever is setting it up needs to give it a DNS record.