docs: update image reference in README and rename file

[ttypic]

update image reference in README and rename file

Summary by CodeRabbit

• Documentation
  • Updated the header image displayed in the README file.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 9bc70ff3-69db-445a-8058-323b7c61e276

📥 Commits

Reviewing files that changed from the base of the PR and between c2798e2 and d845304.

⛔ Files ignored due to path filters (1)

• images/flutter-github.png is excluded by !**/*.png

📒 Files selected for processing (1)

• README.md

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Walkthrough

The README.md header image reference was updated, changing the image file path from images/flutterSDK-github.png to images/flutter-github.png. No other content or documentation was modified.

Changes

Cohort / File(s)	Summary
README Header Image Update README.md	Updated header image file path from flutterSDK-github.png to flutter-github.png.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐰 A flutter of change, so simple and light,
Just an image path shifted—now perfectly right!
From SDK to flutter, the name takes its flight,
One line rearranged makes the README bright! ✨

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix-readme-image

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