docs: update cover image in readme

[Yggdrasill501]

Summary by CodeRabbit

• Documentation
  • Updated the project README with a visual cover image, replacing the text header for improved repository presentation.

[linear]

MAR-342 Update preview image for OSS repos

[coderabbitai]

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⛔ Files ignored due to path filters (1)

• deepnote-jupyterlab-cover-image.png is excluded by !**/*.png

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📝 Walkthrough

Walkthrough

The README title is replaced with an image badge. The header "# JupyterLab Deepnote" is substituted with an embedded image reference pointing to a cover image file. No code or functional changes are involved; this is a documentation presentation update only.

Possibly related PRs

• docs: update readme #49: Modifies the README's top header section with title/badge changes.

Suggested reviewers

• dinohamzic
• jamesbhobbs

Pre-merge checks

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	You can run @coderabbitai generate docstrings to improve docstring coverage.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title Check	✅ Passed	The title "docs: update cover image in readme" directly aligns with the changeset, which replaces the README title header with a cover image badge. The title uses the standard "docs:" prefix appropriately, is concise and specific, and avoids vague language. A reviewer scanning history would immediately understand that this PR updates documentation with a cover image in the README.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 69.56%. Comparing base (ef82139) to head (64eff99).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #68   +/-   ##
=======================================
  Coverage   69.56%   69.56%           
=======================================
  Files          13       13           
  Lines         253      253           
  Branches       28       28           
=======================================
  Hits          176      176           
  Misses         73       73           
  Partials        4        4           

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[jamesbhobbs]

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