docs: update cover image in readme

[Yggdrasill501]

No description provided.

[linear]

MAR-342 Update preview image for OSS repos

[coderabbitai]

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[github-actions]

📦 Python package built successfully!

• Version: 1.0.0.dev4+cac32f6
• Wheel: deepnote_toolkit-1.0.0.dev4+cac32f6-py3-none-any.whl
• Install:

  pip install "deepnote-toolkit @ https://deepnote-staging-runtime-artifactory.s3.amazonaws.com/deepnote-toolkit-packages/1.0.0.dev4%2Bcac32f6/deepnote_toolkit-1.0.0.dev4%2Bcac32f6-py3-none-any.whl"

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.60%. Comparing base (a91be2c) to head (ff74f7c).
⚠️ Report is 2 commits behind head on filipzitny/mar-340-create-deepnote-toolkit-readme.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@                                  Coverage Diff                                  @@
##           filipzitny/mar-340-create-deepnote-toolkit-readme      #13      +/-   ##
=====================================================================================
+ Coverage                                              76.58%   76.60%   +0.02%     
=====================================================================================
  Files                                                     98       99       +1     
  Lines                                                   5471     5476       +5     
  Branches                                                 748      748              
=====================================================================================
+ Hits                                                    4190     4195       +5     
  Misses                                                  1281     1281              

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