refactor(duckdns): improve config and remove gui

apps/duckdns/config.json

@@ -6,6 +6,7 @@
   "id": "duckdns",
   "description": "Duck DNS is a free service which will point a DNS (sub domains of duckdns.org) to an IP of your choice",
   "tipi_version": 1,
+  "no_gui": true,
   "version": "b14c520a-ls8",
   "categories": ["network"],
   "short_desc": "Duck DNS is a free Dynamic DNS service",

apps/duckdns/docker-compose.yml

@@ -1,4 +1,4 @@
-version: "3.9"
+version: '3.9'
 services:
   duckdns:
     container_name: duckdns # Should be exact same name as "id" field in config.json
@@ -12,9 +12,7 @@ services:
       - UPDATE_IP=${DUCKDNS_UPDATE_IP}
       - LOG_FILE=${DUCKDNS_ENABLE_LOG_FILE}
     volumes:
-      - ${APP_DATA_DIR}/data:/config
-    ports:
-      - ${APP_PORT}:80
+      - ${APP_DATA_DIR}/data/config:/config
     restart: unless-stopped
     networks:
       - tipi_main_network

apps/duckdns/metadata/description.md

@@ -2,8 +2,6 @@
 
 [Duckdns](https://duckdns.org/) is a free service which will point a DNS (sub domains of duckdns.org) to an IP of your choice. The service is completely free, and doesn't require reactivation or forum posts to maintain its existence.
 
-[![duckdns](https://raw.githubusercontent.com/linuxserver/docker-templates/master/linuxserver.io/img/duckdns.png)](https://duckdns.org/)
-
 ## Application Setup
 
 - Go to the [duckdns website](https://duckdns.org/), register your subdomain(s) and retrieve your token
@@ -12,7 +10,7 @@
 
 ## Notice regarding automatic detection
 
-Using the `UPDATE_IP` variable whatever its value (`ipv4`, `ipv6` or `both`) uses external *Cloudflare whoami* service to detect public IP addresses.
+Using the `UPDATE_IP` variable whatever its value (`ipv4`, `ipv6` or `both`) uses external _Cloudflare whoami_ service to detect public IP addresses.
 **Be aware that using this variable will query a third-party service other than DuckDNS.**
 
 Omitting the `UPDATE_IP` variable uses DuckDNS for detection and only supports IPv4.