Replace feather icons with lucide icons

[owi92]

There are two feather icons the we use that are missing from lucide icons: edit and edit3. I left these as feather icons, but we could consider using similar ones from lucide (though I do like the feather ones more).

Closes #988

[LukasKalbertodt]

Thanks for tackling this task!

edit and edit3 seem to have been renamed to pen-square and pen-line respectively. Or were you talking about those? I don't see a difference to the feather ones.

[LukasKalbertodt]

Again, thanks for doing this probably-not-the-most-fun-of-all task!