Remove unused import-sql image (#738)

import-sql image is not used anywhere in OMT, deleting.

docker-compose.yml

@@ -67,17 +67,6 @@ services:
       - ./data:/import
       - ./build:/mapping
       - cache:/cache
-  import-sql:
-    # This target is obsolete, and was left for backwards compatibility
-    # Use openmaptiles-tools target instead
-    image: "openmaptiles/openmaptiles-tools:${TOOLS_VERSION}"
-    command: import-sql
-    env_file: .env
-    networks:
-      - postgres_conn
-    volumes:
-      - .:/tileset
-      - ./build:/sql
   openmaptiles-tools:
     image: "openmaptiles/openmaptiles-tools:${TOOLS_VERSION}"
     env_file: .env