Copy relative path to file in Helix

In recent weeks I’ve accidentally migrated from Neovim to Helix. I say “accidentally” because I wasn’t really intending to switch. There was a post on Lobste.rs called “Notes on switching to Helix from vim” that I read about a month ago, which inspired me to give Helix a bit of a try. My expectation had been that it’d be an interesting experiment but instead I found myself choosing to use Helix…