Add sort function

[KierenB]

something like
sort ascending or sort descending would be great, so that my tasks due today appeared at the top of my daily note task list when I use:

not done
due before 2021-07-15

(note that today is July 14, so it shows me all tasks due before tomorrow, but not tomorrow's tasks)

[schemar]

Hey, already tracked in #8 👍