fix: update networking for Yacht (#5)

If Yacht isn't on the correct network, the NGINX service fails because it can't find it.

ansible/templates/yacht-stack.yml.j2

@@ -3,16 +3,20 @@ volumes:
     driver: local
     name: yacht_config
 networks:
-  neon-core:
+  neon_neon-core:
     external: true
 
 services:
   yacht:
     image: selfhostedpro/yacht
     restart: unless-stopped
     container_name: yacht
+    networks:
+      neon_neon-core:
+        aliases:
+          - yacht
     ports:
       - 8000:8000
     volumes:
       - /var/run/docker.sock:/var/run/docker.sock
-      - yacht_config:/config
+      - yacht_config:/config