Add multi-mode HTML, Docker, Helm chart, and deploy script

- Add shop-mode.html and project-mode.html for separate calculation
modes - Refactor index.html as a landing page for mode selection - Add
Dockerfile with optimized nginx config and healthcheck - Add
.dockerignore for cleaner Docker builds - Add deploy.sh for
Helm/Kubernetes deployment automation - Add helm-chart/ with
values.yaml, Chart.yaml, templates, and documentation - Update README.md
with full instructions, features, and CI/CD examples

helm-chart/templates/NOTES.txt

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+1. Get the application URL by running these commands:
+{{- if .Values.ingress.enabled }}
+{{- range $host := .Values.ingress.hosts }}
+  {{- range .paths }}
+  http{{ if $.Values.ingress.tls }}s{{ end }}://{{ $host.host }}{{ .path }}
+  {{- end }}
+{{- end }}
+{{- else if contains "NodePort" .Values.service.type }}
+  export NODE_PORT=$(kubectl get --namespace {{ .Release.Namespace }} -o jsonpath="{.spec.ports[0].nodePort}" services {{ include "common.fullname" . }})
+  export NODE_IP=$(kubectl get nodes --namespace {{ .Release.Namespace }} -o jsonpath="{.items[0].status.addresses[0].address}")
+  echo http://$NODE_IP:$NODE_PORT
+{{- else if contains "LoadBalancer" .Values.service.type }}
+     NOTE: It may take a few minutes for the LoadBalancer IP to be available.
+           You can watch the status of by running 'kubectl get --namespace {{ .Release.Namespace }} svc -w {{ include "common.fullname" . }}'
+  export SERVICE_IP=$(kubectl get svc --namespace {{ .Release.Namespace }} {{ include "common.fullname" . }} --template "{{"{{ range (index .status.loadBalancer.ingress 0) }}{{.}}{{ end }}"}}")
+  echo http://$SERVICE_IP:{{ .Values.service.port }}
+{{- else if contains "ClusterIP" .Values.service.type }}
+  export POD_NAME=$(kubectl get pods --namespace {{ .Release.Namespace }} -l "app.kubernetes.io/name={{ include "common.name" . }},app.kubernetes.io/instance={{ .Release.Name }}" -o jsonpath="{.items[0].metadata.name}")
+  export CONTAINER_PORT=$(kubectl get pod --namespace {{ .Release.Namespace }} $POD_NAME -o jsonpath="{.spec.containers[0].ports[0].containerPort}")
+  echo "Visit http://127.0.0.1:8080 to use your application"
+  kubectl --namespace {{ .Release.Namespace }} port-forward $POD_NAME 8080:$CONTAINER_PORT
+{{- end }}
+
+2. The Calcolatore Prezzi Software application has been deployed!
+   - Main menu: /index.html
+   - Project mode: /project-mode.html
+   - Shop mode: /shop-mode.html

helm-chart/templates/_helpers.tpl

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+{{/*
+Expand the name of the chart.
+*/}}
+{{- define "calcolatore.name" -}}
+{{- default .Chart.Name .Values.nameOverride | trunc 63 | trimSuffix "-" }}
+{{- end }}
+
+{{/*
+Create a default fully qualified app name.
+*/}}
+{{- define "calcolatore.fullname" -}}
+{{- if .Values.fullnameOverride }}
+{{- .Values.fullnameOverride | trunc 63 | trimSuffix "-" }}
+{{- else }}
+{{- $name := default .Chart.Name .Values.nameOverride }}
+{{- if contains $name .Release.Name }}
+{{- .Release.Name | trunc 63 | trimSuffix "-" }}
+{{- else }}
+{{- printf "%s-%s" .Release.Name $name | trunc 63 | trimSuffix "-" }}
+{{- end }}
+{{- end }}
+{{- end }}
+
+{{/*
+Create chart name and version as used by the chart label.
+*/}}
+{{- define "calcolatore.chart" -}}
+{{- printf "%s-%s" .Chart.Name .Chart.Version | replace "+" "_" | trunc 63 | trimSuffix "-" }}
+{{- end }}
+
+{{/*
+Common labels
+*/}}
+{{- define "calcolatore.labels" -}}
+helm.sh/chart: {{ include "calcolatore.chart" . }}
+{{ include "calcolatore.selectorLabels" . }}
+{{- if .Chart.AppVersion }}
+app.kubernetes.io/version: {{ .Chart.AppVersion | quote }}
+{{- end }}
+app.kubernetes.io/managed-by: {{ .Release.Service }}
+{{- end }}
+
+{{/*
+Selector labels
+*/}}
+{{- define "calcolatore.selectorLabels" -}}
+app.kubernetes.io/name: {{ include "calcolatore.name" . }}
+app.kubernetes.io/instance: {{ .Release.Name }}
+{{- end }}
+
+{{/*
+Create the name of the service account to use
+*/}}
+{{- define "calcolatore.serviceAccountName" -}}
+{{- if .Values.serviceAccount.create }}
+{{- default (include "calcolatore.fullname" .) .Values.serviceAccount.name }}
+{{- else }}
+{{- default "default" .Values.serviceAccount.name }}
+{{- end }}
+{{- end }}

helm-chart/templates/configmap.yaml

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+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: {{ include "calcolatore.fullname" . }}-html-content
+  labels:
+    {{- include "calcolatore.labels" . | nindent 4 }}
+data:
+  # Note: In a real deployment, you would use a CI/CD pipeline to inject these files
+  # or mount them from a separate volume. This is just a simple example.
+  # You can also use --set-file flag with helm to inject files:
+  # helm install myapp ./helm-chart \
+  #   --set-file configMaps.html-content.data.index\.html=./index.html \
+  #   --set-file configMaps.html-content.data.project-mode\.html=./project-mode.html \
+  #   --set-file configMaps.html-content.data.shop-mode\.html=./shop-mode.html
+
+  index.html: |
+    <!-- Menu/Landing page - Content will be injected during deployment -->
+    <!DOCTYPE html>
+    <html>
+    <head>
+      <title>Calcolatore Prezzi - Selezione Modalità</title>
+      <meta http-equiv="refresh" content="0; url=https://example.com/">
+    </head>
+    <body>
+      <p>Loading...</p>
+    </body>
+    </html>
+
+  project-mode.html: |
+    <!-- Project mode - Content will be injected during deployment -->
+    <!DOCTYPE html>
+    <html>
+    <head>
+      <title>Calcolatore Prezzi - Modalità Progetto</title>
+      <meta http-equiv="refresh" content="0; url=https://example.com/project-mode.html">
+    </head>
+    <body>
+      <p>Loading...</p>
+    </body>
+    </html>
+
+  shop-mode.html: |
+    <!-- Shop mode - Content will be injected during deployment -->
+    <!DOCTYPE html>
+    <html>
+    <head>
+      <title>Calcolatore Prezzi - Modalità Negozio</title>
+      <meta http-equiv="refresh" content="0; url=https://example.com/shop-mode.html">
+    </head>
+    <body>
+      <p>Loading...</p>
+    </body>
+    </html>