feat: scaffold Go project with cobra CLI, Makefile, and config

Set up the Go module, directory structure, and minimal CLI entrypoint
for the awesome-docker Go rewrite. Includes:
- cobra-based CLI with version command
- Makefile with build/test/lint/check/health/report/clean targets
- config/exclude.yaml migrated from tests/exclude_in_test.json
- config/website.tmpl.html copied from website/index.tmpl.html
- .gitignore updated for Go binary

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.gitignore

@@ -11,3 +11,6 @@ website/table.html
 .idea
 **/.DS_Store
 .worktrees
+
+# Go
+/awesome-docker