Add static crossword site with nginx image and k8s manifests

- site/index.html: Russian literature crossword page
- Dockerfile + nginx conf serving on 8080 with /healthz
- k8s Deployment + NodePort Service (31380) in plpark-int-ns
- Jenkinsfile: build/push to gitea registry, apply to rancher

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

.gitignore

@@ -0,0 +1,7 @@
+.idea/
+*.iml
+*.iws
+
+.vscode/
+
+*.log