Allow users to configure ignored items/bookmarks

### Describe the feature you'd like to request

Users should be able to influence which bookmarks are ignored.

### Describe the solution you'd like

Maybe a regex option would make sense, but this would be a very power user feature.

### Describe alternatives you've considered

.

Start by locating the existing logic that decides which bookmarks are ignored and the configuration entry point for user preferences. Clarify the expected matching behavior, including whether regex support is required, with maintainers before implementation. Done means users can configure ignored bookmarks and the behavior is covered by appropriate tests.

Written by the indexing model from the issue text.