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>

cmd/awesome-docker/main.go

@@ -0,0 +1,23 @@
+package main
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/spf13/cobra"
+)
+
+func main() {
+	root := &cobra.Command{
+		Use:   "awesome-docker",
+		Short: "Quality tooling for the awesome-docker curated list",
+	}
+	root.AddCommand(
+		&cobra.Command{Use: "version", Short: "Print version", Run: func(cmd *cobra.Command, args []string) {
+			fmt.Println("awesome-docker v0.1.0")
+		}},
+	)
+	if err := root.Execute(); err != nil {
+		os.Exit(1)
+	}
+}