Zed fails to parse git URLs with a slash prefix correctly when generating permalinks

[zacharyhamm]

If your github remote URL looks like:

[email protected]:/zed-industries/zed

Zed's "get permalink" will return a link to just github.com/zed-industries, incorrectly reading the "owner" of the repo as a blank string.

The following PR resolves that issue:

https://github.com/zed-industries/zed/compare/main...zacharyhamm:zed:fix/github-with-slash-prefix?expand=1