Remove badges

Author: Jiaxin Fan

docs/users/standalone/README.md

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 # Tests for OpenWhisk NodeJS Runtime as Standalone Container
-[![License](https://img.shields.io/badge/license-Apache--2.0-blue.svg)](http://www.apache.org/licenses/LICENSE-2.0)
-[![Continuous Integration](https://github.com/apache/openwhisk-runtime-nodejs/actions/workflows/ci.yaml/badge.svg)](https://github.com/apache/openwhisk-runtime-nodejs/actions/workflows/ci.yaml)
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 This README walks you through how to build, customise and test Apache OpenWhisk Node.js runtime images.
 ## Pre-requisites
 - [Gradle](https://gradle.org/)