zed-editor: make $out/bin/zed the CLI, not the main binary

The CLI allows opening new files/folders while the app is still running, as well
as starting the app in the background without taking up your terminal.

This matches the official bundle-linux script: https://github.com/zed-industries/zed/blob/main/script/bundle-linux

Before:

```sh
$ zed flake.nix
zed is already running
```

After:

```sh
$ zed flake.nix
$ # works!
```

I'm not sure what the current status of this package's Darwin support is; the
new code I added should probably be Linux-only, but so should the .desktop file
generation which is currently run unconditionally, so I left it as running
unconditionally for now.

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