Allow links to be nested under other links

[xko]

Quite often I just want to chose one bookmark to be parent of the others - don't want to create a topic.
Tried this by editing the synced org file - worked great, except some minor UI problems (no icon, edit doesn't show the URL).
Can this be supported officially?

[rynomad]

This is a critical feature for my use case as well. I'd be happy to work on the implementation if a PR would be welcome.