feat: Configure production deployment with math-tables namespace and ingress

Changes made:

- Remove problematic configuration-snippet from base ingress

- Add namespace creation for math-tables

- Configure ingress with nginx class and letsencrypt-prod issuer

- Set production hostname to math-tables.cl1.parano.ch

- Reduce production replicas to 1

- Update copyright year in index.html

deploy/overlays/production/security-patch.yaml

@@ -0,0 +1,27 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: math-exercises-app
+spec:
+  template:
+    spec:
+      # Additional security context for production
+      securityContext:
+        runAsNonRoot: true
+        runAsUser: 1000
+        fsGroup: 2000
+        seccompProfile:
+          type: RuntimeDefault
+      containers:
+      - name: math-exercises
+        # Additional security settings for production
+        securityContext:
+          allowPrivilegeEscalation: false
+          readOnlyRootFilesystem: true
+          runAsNonRoot: true
+          runAsUser: 1000
+          capabilities:
+            drop:
+              - ALL
+            add:
+              - NET_BIND_SERVICE