Publish theme with new brand assets and styling

[taysea]

• Clean up/check NEXT branch to ensure the following are represented:
  • CTA primary and alternate buttons
  • Backgrounds (gradients/textures) (Matt) Backgrounds restructure #277
  • 6px rounding for buttons and other inputs
    • pending: Allow DateInput rounding to be controlled via theme grommet#6385
  • brand green for buttons instead of light/dark variants
  • Checkbox rounding to 4px
• Write v4 migration notes/guide/release notes
• Publish new theme, major release

After release:

• Outline necessary Figma changes:
  • Brand Refresh - Update Figma Button hpe-design-system#2937
  • Brand Refresh - Update Figma CheckBox hpe-design-system#2938
  • Brand Refresh - Update Figma input components hpe-design-system#2939
  • Brand Refresh - add gradients and textures as tokens in Figma (alongside colors?) hpe-design-system#2940
• Add guidance to Design System site to reflect latest brand assets and theme:
  • Add CTA vs Primary button guidance:
    • Add guidance for CTA buttons vs primary action buttons hpe-design-system#2936
  • "Brand Ingredients" page that includes:
    • datawaves/gradient/light and shadow backgrounds/dynamic type, cross-link back to brand central
    • CTA button (cross-link to Button page)
    • HPE Badge - discuss that HPE GreenLake badge will be provided by Global Header/Footer Service
    • Add brand assets page hpe-design-system#2951

[taysea]

Final step, tracked by grommet/hpe-design-system#2953, is to publish guidance on how to implement the distinctive brand assets.

[taysea]

Also, look into case of primary + color button: #283