docs: add JSX runtime comparison resource

[Müslim Yılmaz (MuslumYilmaz)]

Summary

• Add one practical comparison of the classic and automatic JSX runtimes after the React guide's opening JSX paragraph.
• Connect the existing TypeScript JSX overview to concrete Babel and TypeScript transform output, configuration, and tooling implications.

Validation

• Documentation-only net diff: two added Markdown lines, zero deletions.
• In a normal browser session, the target returned HTTP 200 with full public content, a self-canonical URL, and index,follow.
• A separate non-browser preflight intermittently received a Vercel security-challenge 429. I am flagging this because automated link checks may need review.
• No local website build was run; the change was made through GitHub's web editor.

Disclosure

I am the creator and maintainer of FrontendAtlas. The linked page is free; the wider platform also includes paid content. I used AI assistance to help draft this pull request and reviewed the final change. No paid, affiliate, reciprocal, or special link treatment is requested.

[Jake Bailey (jakebailey)]

Sorry, but we're not going to be linking out to your personal site