docs: add AWS Data Firehose + S3 badge

[CoreyLeath-code]

Summary

• add a dedicated orange AWS — Data Firehose + S3 badge to the SentinelAI README
• keep the existing AWS telemetry CI badge
• group the README badges into centered validation/platform rows

The badge links to docs/aws-firehose-s3.md, which documents the already-merged Firehose → S3 telemetry implementation. This is a documentation-only change and does not add or overstate any new deployment claim.

Summary by CodeRabbit

• Documentation
  • Reformatted the README badge section into two centered rows for improved readability.
  • Preserved all existing workflow, performance, infrastructure, security, and license badges.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 5b4a933f-6382-4d72-8909-c0e21a0af08b

📥 Commits

Reviewing files that changed from the base of the PR and between dfe3b9f and 05f95aa.

📒 Files selected for processing (1)

• README.md

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📝 Walkthrough

Walkthrough

The README badge section was reformatted into two centered <p align="center"> blocks. The existing workflow badges remain grouped together. Shield badges, including AWS Data Firehose and S3, form the second group.

Changes

README Badge Layout

Layer / File(s)	Summary
Center and group README badges README.md	Workflow badges now use one centered paragraph block. Shield badges use a second centered paragraph block, including the AWS Data Firehose and S3 badge.

Estimated code review effort: 1 (Trivial) | ~2 minutes

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/aws-firehose-s3

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