docs: revise Ruff setup instructions for Zed editor

[LoicRiegel]

Summary

Updated Ruff installation instructions for Zed editor.

Details

Ruff support is now built in and does not require installing an extension anymore. zed-industries/zed#37804

Also FYI this open issue is related: zed-industries/zed#40266.

But I've just tried the last code snippet from the docs on a fresh Zed install on Windows and it worked well without installing any extension.

[MichaReiser]

Thank you. There's probably more that we can remove, now that ruff is used as the default formatter and linter (it's enabled by default) as mentioned here https://zed.dev/docs/languages/python#code-formatting--linting

[LoicRiegel]

I can have a look

[injust]

Zed comes with formatting, linting, and organizing imports out-of-the-box now. If you want Ruff to apply fixes when formatting:

{
    "languages": {
        "Python": {
            "code_actions_on_format": { "source.fixAll.ruff": true }
        }
    }
}