Kaeser Jonathan

Adds the 'cleanOpenApiDocs' task to the plugin

1

This pull requests adds a 'cleanOpenApiDocs' task to the plugin that will clean the output of the 'generateOpenApiDocs' task.

I just pulled the project locally and tried to build it as explained in the README file ```./gradlew clean pTML``` I then had the following error: ``` FAILURE: Build failed...