fix(docs): use the standard picture element to display the logo

[leops]

Summary

This fixes how the Rome logo is displayed in the README when the markdown file is rendered outside of GitHub. The logo exists in two versions for dark and light mode, and the correct version to display in the readme was selected using the gh-light-mode-only and gh-dark-mode-only fragments. This logic is GitHub-specific though, and doesn't work when the readme file is rendered outside of GitHub (for instance on the rome npm package: https://www.npmjs.com/package/rome/v/0.10.1-nightly.a9db0f0). I've replaced the images with the standard picture element to automatically select the correct version of the image using the prefers-color-scheme: dark CSS media query.

I've also rolled up a simple fix to the release_js_api workflow into this, it fixes the creation of GitHub releases for the API by removing the attachments since the JS API doesn't have any build artifact.

Test Plan

Push a new nightly version to npm and check the logo is only rendered once

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