updated Readme

Author: timoschd

README.md

@@ -1,6 +1,6 @@
 # BigQuery MCP server
 
-[![smithery badge](https://smithery.ai/badge/mcp-server-bigquery)](https://smithery.ai/server/mcp-server-bigquery)
+[![Build and Push to Docker Hub](https://github.com/timoschd/mcp-server-bigquery/actions/workflows/docker-publish.yml/badge.svg)](https://github.com/timoschd/mcp-server-bigquery/actions/workflows/docker-publish.yml)
 
 A Model Context Protocol server that provides access to BigQuery. This server enables LLMs to inspect database schemas and execute queries.