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/base/kustomization.yaml

@@ -0,0 +1,19 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+
+resources:
+- deployment.yaml
+- service.yaml
+- ingress.yaml
+- network-policy.yaml
+- pod-disruption-budget.yaml
+- configmap.yaml
+
+# Common labels to apply to all resources
+commonLabels:
+  app.kubernetes.io/name: math-exercises
+  app.kubernetes.io/instance: math-exercises-instance
+  app.kubernetes.io/version: "1.0"
+  app.kubernetes.io/component: web
+  app.kubernetes.io/part-of: math-suite
+  app.kubernetes.io/managed-by: kustomize