[Backport 11.5] [TASK] Overhaul PAGE chapter (#1168)

* [TASK] Overhaul PAGE chapter

* Use confvals instead of tables
* Correct indentation
* Give headlines to examples
* Introduce a toc for the properties

* Apply suggestions from code review

Co-authored-by: Chris Müller <[email protected]>

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Co-authored-by: lina.wolf <[email protected]>
Co-authored-by: Lina Wolf <[email protected]>
Co-authored-by: Chris Müller <[email protected]>