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>

go.mod

@@ -0,0 +1,10 @@
+module github.com/veggiemonk/awesome-docker
+
+go 1.25.0
+
+require github.com/spf13/cobra v1.10.2
+
+require (
+	github.com/inconshreveable/mousetrap v1.1.0 // indirect
+	github.com/spf13/pflag v1.0.9 // indirect
+)