Creates a new GuidelinePageSection, either on top of a page or after a given section.
All mutations have exactly one input field called input with a unique input and return type. This is useful to write mutations with variables, so there is always one single variable per mutation. This makes it easier to use and reuse them.
The id of GuidelinePage on which the GuidelinePageSection should be inserted.
The id of the GuidelinePageSection after which the newly created GuidelinePageSection should be inserted. If null or undefined, the GuidelinePageSection will be inserted at the beginning of the GuidelinePage.
The GuidelinePageSection that was just created.