fix: improve docker-compose guacd config for ARM64 and network isolation

docker/docker-compose.yml

@@ -1,3 +1,4 @@
+services:
 services:
   termix:
     image: ghcr.io/lukegus/termix:latest
@@ -9,6 +10,7 @@ services:
       - termix-data:/app/data
     environment:
       PORT: "8080"
+      GUACD_HOST: "guacd"
     depends_on:
       - guacd
     networks:
@@ -18,8 +20,6 @@ services:
     image: guacamole/guacd:1.6.0
     container_name: guacd
     restart: unless-stopped
-    ports:
-      - "4822:4822"
     networks:
       - termix-net