Bookmarks: Export to XBEL

[sjehuda]

Bookmarks are store as XBEL at ~/.config/otter/bookmarks.xbel, and it would be good to have a graphical interface to export (i.e. copy) it to a desired location.

See gemini://woodpeckersnest.space/~schapps/journal/2025-01-08-deprecate-netscape-bookmarks.gmi