docs(readme): restore banner image

[spomichter]

Restores the Dimensional banner image from main to the dev README, above the SVG logos.

[greptile-apps]

Greptile Summary

Adds the Dimensional banner image from GitHub user-attachments above the existing SVG logos in the README header section.

• Restores visual branding to the dev branch README
• Uses GitHub-hosted image URL from user-attachments
• Properly formatted with width attribute and alt text
• Positioned above the theme-specific SVG logos

Confidence Score: 5/5

• This PR is completely safe to merge with no risk
• Documentation-only change that adds a single banner image to README with proper formatting - no code logic, dependencies, or functionality affected
• No files require special attention

Important Files Changed

Filename	Overview
README.md	Adds banner image above SVG logos - no issues found

_{Last reviewed commit: 948baa7}

[greptile-apps]

_{1 file reviewed, no comments}

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