Add site index, deploy script and Green Man mask build

Static site for builds.kestrelsnest.social: an index page with one card per build, an rsync deploy script modelled on pantry, and the Green Man mask guide with its templates and print files.

Co-Authored-By: Claude Fable 5.2 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GrX9qMoNihcWLX3xoJhabw

.gitignore

@@ -0,0 +1,10 @@
+# macOS
+.DS_Store
+
+# Editor files
+*.swp
+*.swo
+*~
+
+# Claude Code local settings
+.claude/