Add EY quote about their CNAB case study

[carolynvs]

What does this change

Include a quote of EY from their case study of using Porter for their VAT solution on the homepage.

Preview available at https://deploy-preview-2384--porter.netlify.app/

What issue does it fix

Closes #2102

Notes for the reviewer

N/A

Checklist

• Did you write tests?
• Did you write documentation?
• Did you change porter.yaml or a storage document record? Update the corresponding schema file.
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Reviewer Checklist

• Comment with /azp run test-porter-release if a magefile or build script was modified
• Comment with /azp run porter-integration if it's a non-trivial PR