Update index.md: add link to Proxmox VE Helper-Scripts

Update index.md: add link to Proxmox VE Helper-Scripts

Author: muescha

docs/src/third-party/index.md

@@ -12,6 +12,7 @@ Known integrations:
 - [HomeAssistant Hass.io plugin](https://github.com/hassio-addons/addon-nginx-proxy-manager)
 - [UnRaid / Synology](https://github.com/jlesage/docker-nginx-proxy-manager)
 - [Proxmox Scripts](https://github.com/ej52/proxmox-scripts/tree/main/apps/nginx-proxy-manager)
+- [Proxmox VE Helper-Scripts](https://community-scripts.github.io/ProxmoxVE/scripts?id=nginxproxymanager)
 - [nginxproxymanagerGraf](https://github.com/ma-karai/nginxproxymanagerGraf)