refactor: simplify k8s deployment to pure kubectl

- Remove kustomization.yaml and all kustomize references
- Remove deploy-pi.sh and vpa-pi-helper.sh helper scripts
- Remove redundant ConfigMap from vpa.yaml
- Update README.md to focus on standard kubectl commands
- Keep deployment simple with just YAML files and kubectl
- Maintain Pi 5 optimizations and VPA functionality
- No complex tooling required for deployment

k8s/ingress.yaml

@@ -0,0 +1,27 @@
+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  name: unitforge
+  labels:
+    app: unitforge
+    component: ingress
+  annotations:
+    kubernetes.io/ingress.class: "nginx"
+    nginx.ingress.kubernetes.io/rewrite-target: /
+    nginx.ingress.kubernetes.io/proxy-body-size: "5m"
+    nginx.ingress.kubernetes.io/proxy-connect-timeout: "10"
+    nginx.ingress.kubernetes.io/proxy-send-timeout: "30"
+    nginx.ingress.kubernetes.io/proxy-read-timeout: "30"
+spec:
+  ingressClassName: nginx
+  rules:
+    - host: app.unitforge.192.168.153.243.nip.io
+      http:
+        paths:
+          - path: /
+            pathType: Prefix
+            backend:
+              service:
+                name: unitforge
+                port:
+                  number: 8000