docs: document Makefile usage

docs/DEPLOYMENT.md

@@ -13,7 +13,7 @@ By: Codex (GPT-5)
 
 Beispiel:
 ```bash
-sudo ./scripts/install.sh
+make install
 sudo systemctl status skd.service
 ```
 
@@ -22,6 +22,15 @@ sudo systemctl status skd.service
 ./scripts/run.sh
 ```
 
+## Makefile Targets (Ops)
+```bash
+make install
+make up
+make down
+make update
+make uninstall
+```
+
 ## Remote-Deploy (SSH)
 `./scripts/deploy.sh` packt das Repo und deployt es auf einen Zielhost.
 Konfiguration in `deploy_hosts.yml`.