README - Replace mentions of Zig with Rust

[Moire9]

What does this PR do?

Updates README to reflect the recent codebase changes in #30412. No code changes.

[claude]

Claude Code Review

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[coderabbitai]

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ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between 63035b3 and 81c0143.

📒 Files selected for processing (1)

• README.md

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Walkthrough

The PR updates the README.md introduction to reflect that the Bun runtime is written in Rust instead of Zig. This is a single-line documentation change to the "What is Bun?" description, keeping the rest of the introductory text unchanged.

Changes

Documentation Update

Layer / File(s)	Summary
Bun language description update README.md	The "What is Bun?" introductory description is updated to state that Bun is written in Rust instead of Zig.

🚥 Pre-merge checks | ✅ 3 | ❌ 1

❌ Failed checks (1 inconclusive)

Check name	Status	Explanation	Resolution
Description check	❓ Inconclusive	The description is incomplete; it only addresses the first required section while omitting the 'How did you verify your code works?' section from the template.	Add the 'How did you verify your code works?' section to fully comply with the repository's description template.

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately and concisely summarizes the main change: replacing Zig mentions with Rust in the README documentation.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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[ZoeS17]

Rolled up into #30747 now.

[heygsc]

same #30677 🫪

[robobun]

Thank you for taking the time to open this, and sorry it sat unreviewed for so long. The same README fix is included in #33065, which updates the remaining Zig references across the README and the rest of the docs in one pass, and a maintainer has signed off on merging that one. Closing this as superseded. Thanks again for contributing.