[Shewart]

Summary

Docs site moved to its own repo

• New home: the docs site now lives in shellui-dev/shell-icons-docs, with the history of docs/ShellIcons.Docs carried over (git subtree split).
• Built from released packages: it uses the published ShellIcons.Blazor package instead of a project reference, so the docs always show a released version.
• Deploys from there: that repo builds a Docker image on every PR and pushes docker.zuluville.com/shell-icons-docs on merge, with its registry secrets kept in that repo only.

Removed here

• docs/ShellIcons.Docs and its entry in ShellIcons.slnx.
• .github/workflows/docs.yml, the GitHub Pages deploy; the site is served as a container now.
• README and RELEASING now point to the new repo.

Breaking changes

None for the packages.

Test plan

• ShellIcons.slnx builds with 0 warnings; 135 tests pass (57 generator, 44 Blazor, 34 Avalonia)
• The new repo builds with 0 warnings on ShellIcons.Blazor 0.2.0-alpha; published and run in Production, all 18 pages and their .md versions return 200, llms.txt, agent files and search serve, unknown pages return 404, the icon browser lists 1,555 icons
• First image workflow run in shell-icons-docs (needs REGISTRY_USERNAME / REGISTRY_PASSWORD secrets to push)

Follow-ups

• Add the registry secrets to shell-icons-docs, then let it push the image; redeploy on the server
• Optionally a Portainer webhook so merges redeploy automatically