fix: correctly open URLs surrounded by <>

[poliorcetics]

rustoc can warn about "naked" links that are not surrounded by <>. When fixing the link, helix becomes unable to open the URL, instead opening a file named <URL>.

Since I couldn't think of a single case where a file starting or ending with <> would happen since shells use those as control characters and tend to discourage that pattern, I simply added to the trim list.

[the-mikedavis]

Also see #10157

We want to do away with the surrounding character checking and switch to something similar to what neovim does in this case: #9065

[the-mikedavis]

I'll close this out as I've just merged down #9065 which handles this case. The old code had problems like not handling periods well, for example: Hello: <https://github.com/helix-editor/helix>.

[poliorcetics]

#9065

Oh nice 🤩 I wasn't subscribed to that one