IYY-285: Site editors can add a caption to Image Banner | Update Image Banner component to use caption

[joetower]

IYY-285: Site editors can add a caption to Image Banner

Description of work

• Add image caption to image banner component
• Atomic: IYY-285: Site editors can add a caption to Image Banner | Wiring atomic#292
• YaleSites Platform: IYY-285: Site editors can add a caption to Image Banner yalesites-project#833

Testing Link(s)

• Navigate to the Image Banner Component Story

Functional Review Steps

• Navigate to: https://deploy-preview-450--dev-component-library-twig.netlify.app/?path=/story/molecules-banners--image-banner
• Verify a caption renders under the image
• Verify you can change the caption using the Storybook addons

Design Review

• Verify the designs match the Figma Designs

Accessibility Review

• Verify the component meets Accessibility requirements

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[codechefmarc]

Looks great!