tighter integration of "keditbookmarks"

[z]

https://mail.kde.org/pipermail/okular-devel/2021-August/040423.html

https://bugs.kde.org/show_bug.cgi?id=427465

agreed! A little tighter integration of "keditbookmarks" with Okular 
will enhance Okular tremendously! pdf bookmarks are real essential.