The profile on github.com/chatguard-dev comes from
profile/README.md.
The banner at its top is banner/banner.html, rendered in both colour schemes by banner/render.sh
into profile/banner-light.png and profile/banner-dark.png. It repeats the hero of
chatguard.dev, so render it again when the hero's words change.
SECURITY.md is the security policy GitHub shows for every repository in the
organization that doesn't have its own.