Publish the documentation with GitHub Pages

index.md includes README.md, so the site cannot drift from the repository
documentation, and nothing but build/ is excluded so the README's relative links
keep resolving on the published site.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

_config.yml

@@ -0,0 +1,10 @@
+# GitHub Pages (Jekyll). index.md includes README.md so the site and the
+# repository documentation cannot drift apart.
+title: maas-samba-ad
+description: >-
+  MAAS-deployable Debian image that becomes a Samba Active Directory domain
+  controller: provisions a new domain or joins an existing one on first boot.
+theme: jekyll-theme-cayman
+show_downloads: false
+exclude:
+  - build/

index.md

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+---
+layout: default
+title: maas-samba-ad
+description: Samba Active Directory domain controller image for MAAS
+---
+
+{% include_relative README.md %}