feat: implement beginnings of "design system"

[fkakatie]

Fix #

Test URLs:

• Before: https://main--progressrail--aemsites.aem.live/
• After: https://design--progressrail--aemsites.aem.live/

[aem-code-sync]

Hello, I'm the AEM Code Sync Bot and I will run some actions to deploy your branch and validate page speed.
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• Re-run all PSI checks
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Commits

• 1960b33 ✅ (latest)
• 10b824f ✅
• aba2196 ✅

[aem-code-sync]

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