Allow input examples to display

Related to this issue (#656)

I was trying to add input examples to our form page: https://design.gitlab.com/components/forms

I've discovered that examples will not display unless you add followsDesignSystem: true to the documentation config.

There are still some parts of the input fields that are incomplete, such as the input counter (#648 (closed)). I don't think it's a good idea to wait for these issues to be completed. The counter specifically could take a long time to complete and is blocking our ability to display a basic default input example.

I think we should update the configs to followsDesignSystem: true so we can start adding basic examples.