fix: Move all stacks directly under stacks/ (no category subfolders)

stacks/communication/gotify/compose.yml

@@ -1,27 +0,0 @@
-services:
-  gotify:
-    image: gotify/server:latest
-    container_name: gotify
-    restart: unless-stopped
-    ports:
-      - "127.0.0.1:9091:80"
-    volumes:
-      - gotify_data:/app/data
-    environment:
-      - GOTIFY_DEFAULTUSER_NAME=${SECRET:gotify-admin-user}
-      - GOTIFY_DEFAULTUSER_PASS=${SECRET:gotify-admin-pass}
-    networks:
-      - gotify-network
-    healthcheck:
-      test: ["CMD", "wget", "--spider", "-q", "http://localhost:80/health"]
-      interval: 30s
-      timeout: 10s
-      retries: 3
-      start_period: 10s
-
-volumes:
-  gotify_data:
-
-networks:
-  gotify-network:
-    driver: bridge