Update README.md for remove the docker installer (opea-project#1927)

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ChatQnA/docker_compose/install_docker.sh

@@ -18,7 +18,7 @@ Quick Start Deployment Steps:
 2. Run Docker Compose.
 3. Consume the GraphRAG Service.
 
-Note: If you do not have docker installed you can run this script to install docker : `bash docker_compose/install_docker.sh`
+Note: If you do not have Docker installed you can [install Docker](https://docs.docker.com/engine/install/) first
 
 ### Quick Start: 1.Setup Environment Variable