Add Confluent Cloud promotional banner to README

[viveksnh]

Summary

• Adds a promotional banner for Confluent Cloud at the top of the README
• Banner includes a call-to-action for $400 free credits
• Uses centrally managed SVG from Contentful CMS

Changes

• Added banner image with link to Confluent Cloud signup
• Includes UTM parameters for tracking (utm_term=kafka-connect-elasticsearch)

Visual Preview

The banner displays:

• "Confluent Cloud" branding
• "Start streaming in minutes" tagline
• Process flow: Stream → Connect → Process → Govern
• "$400 Free Credits" CTA button

Testing

• Banner renders correctly in GitHub markdown
• Link directs to Confluent Cloud signup with proper UTM parameters
• Image is served from Contentful CMS

Related

This is part of a broader growth initiative to add consistent banners across Confluent's open source repositories, promoting Confluent's value proposition.

[confluent-cla-assistant]

🎉 All Contributor License Agreements have been signed. Ready to merge.
_{Please push an empty commit if you would like to re-run the checks to verify CLA status for all contributors.}

[sonarqube-confluent]

Analysis Details

0 Issues

• 0 Bugs
• 0 Vulnerabilities
• 0 Code Smells

Coverage and Duplications

• No coverage information (0.00% Estimated after merge)
• No duplication information (0.00% Estimated after merge)

Project ID: kafka-connect-elasticsearch

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