Provides support for customizing welcome content and presentation.

## Package Specification

This package contains the API for customizing the welcome content and presentation. It defines two extension points. The `org.eclipse.ui.intro.config` extension point provides the ability to take full control of welcome and customize all aspects of it. The `org.eclipse.ui.intro.configExtension` extension point provides the ability to extend another plug-in's welcome configuration and modify it. For example, `org.eclipse.ui.intro.config` could be use to completely redefine the structure of the welcome content and `org.eclipse.ui.intro.configExtension` could be used to provide a new theme to an existing welcome configuration.