FEATURE: Remove bookmarks directly from bookmarks list

[tillprochaska]

Is your feature request related to a problem? Please describe.
You currently cannot remove bookmarks from the list. Instead, you have to click on the bookmarked entity, then unbookmark it. This makes it very inconvenient to quickly remove bookmarks, and in many cases this means users just keep old bookmarks around, with the list of bookmarks growing very large.

Describe the solution you'd like
Users should be able to remove bookmarks from the bookmarks list (using a simple delete button). Maybe even bulk-remove bookmarks.

Describe alternatives you've considered
None

Additional context
None