Rename Helm chart to api7ee-demo-k8s

- Changed chart name from api7ee to api7ee-demo-k8s in Chart.yaml
- Renamed helm/api7ee directory to helm/api7ee-demo-k8s
- Updated all references in build.yml workflow
- Updated all references in helm-release.yml workflow
- Updated main README.md with new chart name
- Updated Helm chart README with new chart name
- Verified all old references have been replaced
- Chart packages correctly as api7ee-demo-k8s-{version}.tgz

helm/api7ee-demo-k8s/Chart.yaml

@@ -0,0 +1,17 @@
+apiVersion: v2
+name: api7ee-demo-k8s
+description: A Helm chart for API7 Enterprise Edition demo application
+type: application
+version: 0.1.0
+appVersion: "1.0.0"
+keywords:
+  - api7
+  - api-gateway
+  - web
+  - api
+home: https://demo.commandware.it
+sources:
+  - https://git.commandware.com/demos/api7-demo
+maintainers:
+  - name: CommandWare
+    email: support@commandware.com