Containers support multiple base distros, not just Alpine.
- profile/README.md: broaden intro to mention Alpine, Debian, Ubuntu,
RHEL-compatible, and other bases
- profile/README.md: update two-stage build description to match
profile/README.md
Creates the GitHub organisation profile page shown at
github.com/casjaysdevdocker.
- profile/README.md: org-level README with container catalogue,
quick-start, common env vars, registry locations, and maintainer info
profile/