[feature request] ability to delete bookmarks

[rkulla]

A keyboard shortcut to delete the selected bookmark(s) would be useful, especially for people who like to have a "Read Later" folder for reviewing tutorials, pull-requests, etc.

If this is possible, ideally it would have an optional confirmation prompt and maybe a second shortcut or option to automatically delete and open at the same time (to not have to go back into it to delete later).

Thanks for this very useful plugin!