Update README.md

[tiruman]

New arango.ai logo - old one didn't display.

Notebook Checklist

• Add x to completed tasks
• tutorialName for temporary DB (if applicable)
• Colab link added to ReadMe in the correct alphabetical order
• nbstripout ran on notebook
• Notebook with output added to the example_output folder with _output appended to filename

---

Note

Updates the README header image to use a new ArangoDB logo URL that renders correctly.

• Replaces README logo link with https://docs.arango.ai/Arango_logo.png

^{Written by Cursor Bugbot for commit d671768. This will update automatically on new commits. Configure here.}