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/Chart.yaml

@@ -0,0 +1,26 @@
+apiVersion: v2
+name: calcolatore-prezzi-software
+description: A Helm chart for Calcolatore Prezzi Software application
+type: application
+version: 1.0.0
+appVersion: "1.0.0"
+
+# Dependency on base-helm common chart
+dependencies:
+  - name: base-helm
+    version: "*"
+    repository: "https://git.commandware.com/GitOps/base-helm.git"
+    alias: common
+
+maintainers:
+  - name: Your Name
+    email: your-email@example.com
+
+keywords:
+  - calculator
+  - pricing
+  - software
+  - static-website
+
+sources:
+  - https://github.com/your-repo/calcolatore-prezzi-software