Update button style

[gciotola]

Breaking change: size large has been removed

Related to commercelayer/issues-app#522

What I did

I've updated some buttons styles to match changes in design system.

• Tuned padding and font size
• Changed border color for secondary
• Tuned border radius
• Removed large variant (no app is using this variant)

How to test

Checklist

• Make sure your changes are tested (stories and/or unit, integration, or end-to-end tests).
• Make sure to add/update documentation regarding your changes.
• You are NOT deprecating/removing a feature.

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[pkg-pr-new]

npm i https://pkg.pr.new/commercelayer/app-elements/@commercelayer/app-elements@1019

commit: 8d5f277