chore(cmd): move main file to cmd directory

cmd/main.go

@@ -0,0 +1,19 @@
+package main
+
+import (
+	"os"
+
+	"git.ar21.de/yolokube/grafana-backuper/internal/cmd"
+	"git.ar21.de/yolokube/grafana-backuper/internal/config"
+)
+
+func main() {
+	cfg := &config.Config{}
+
+	rootCmd := cmd.NewRootCommand(cfg)
+	rootCmd.AddCommand(cmd.NewBackupCommand(cfg))
+
+	if err := rootCmd.Execute(); err != nil {
+		os.Exit(1)
+	}
+}