Refactor SWI project CTA section with card components

[russelltrow]

Summary

Restructured the Software Water Intensity (SWI) project call-to-action section to use card components with improved visual hierarchy and clearer separation between member and non-member actions.

Changes

• Wrapped member and non-member CTAs in :::card component blocks for better visual organization
• Converted inline links to dedicated button components with ::button syntax
• Removed bold formatting from section headings (changed ### **Already a member?** to ### Already a member?)
• Simplified body text by removing redundant link syntax and improving readability
• Added two distinct action buttons:
  • "Subscribe to the SWI project" (primary variant) for existing members
  • "Join the Green Software Foundation" (outline variant) for non-members

Implementation Details

• Used the card component pattern already established in the design system
• Button variants (primary and outline) follow existing brand conventions
• Maintained all original URLs and functionality
• Improved content hierarchy by separating the two audience segments visually

https://claude.ai/code/session_01Ef5TmAcXmCxtuffdmzXh3u

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