Schedule should work for page properties

Right now, scheduling works only with normal blocks but not with pages.
If we add a schedule property to the page-property block, the schedule is added correctly, but the page is not shown in the daily journal.

Having a schedule in page properties is useful in multiple scenairos:

  • Add a repeated schedule to revisit the content of a page (e.g. spaced repetition)
  • Projects deadlines, birthday reminders etc.