chore(docs): fix small typo in readme.md

[dielduarte]

Hey team, its me again, studying the codebase and fixing a small typo!

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Summary by cubic

Fix a small typo in the README’s Editor section by removing the duplicated “built on top of” phrase to improve clarity.

^{Written for commit 701db88. Summary will update on new commits.}

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Latest commit: 701db88

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[cubic-dev-ai]

No issues found across 1 file

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.