title: Sonarqube Authentication: Disable Login Field
body: <p>Background: I'm setting up a SonarQube instance for code inspection and I've enabled GitHub Authentication via OAuth. In the spirit of reducing attack vectors, I'd like to remove the username/password login text boxes and functionality. This will force users to only login with GitHub accounts tied to pre-approved organizations.</p>
  
  <p>Is there a property I can set in the sonar.properties file to disable the traditional login form but keep the "Log in with GitHub" button?</p>