docs: replaced old hero banner with clean recreation

[Dominik7272]

Replaced the hero banner with a high quality recreation. Fixed grid artifacts and logo alignment for a cleaner README.

Summary by CodeRabbit

• Documentation
  • Updated banner image reference in README.

[vercel]

@Dominik7272 is attempting to deploy a commit to the motia Team on Vercel.

A member of the Team first needs to authorize it.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: f3fe7560-aa16-4730-bf30-e38fed2ce51d

📥 Commits

Reviewing files that changed from the base of the PR and between 8d4bae0 and e6111b1.

⛔ Files ignored due to path filters (2)

• engine/assets/banner.jpg is excluded by !**/*.jpg
• engine/assets/banner.png is excluded by !**/*.png

📒 Files selected for processing (1)

• README.md

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📝 Walkthrough

Walkthrough

The README.md file's top banner image reference was updated from a JPG to a PNG file format, changing engine/assets/banner.jpg to engine/assets/banner.png. No other content or links were modified.

Changes

Cohort / File(s)	Summary
Documentation README.md	Updated banner image reference from JPG to PNG format in the top banner.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐰 A PNG arrives, so crisp and clear,
The banner now shines without a tear,
From JPG's old and fading past,
This format change will surely last! ✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately reflects the main change: updating the banner image from JPG to PNG with visual improvements, which aligns with the PR objectives.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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