People can have personal profiles by creating a README.md in a repo with the same name as the user. Instructions are at Managing your profile README - GitHub Docs.
This appears to not work for organizations. Has anyone succeeded in making a profile page for an org?
readme for organization front page? has a question that I think is asking the same thing, but the response didn’t mention personal profiles, which seems relevant, and therefore I wonder whether profiles didn’t exist at all at the time of the response.