Remove example window

What does this MR do?

Removes the image of the modal.

The image of the modal has code snippets and a button that says "copy code and open gitlab-ci.yml". It looks like you can actually copy the text and click the button, but it is just a sample image. It creates an awkward experience where a user is clicking on the image to get the text, but its just a screenshot of a screen elsewhere in the application.

I think the documentation reads better without the image.