Simplify design systems section on widget catalog index page

[parlough]

This loop previously looped through items to render them but manually checked their values anyway. Instead of relying on harder to understand Liquid templating logic, just inline the intended cards.

Staged: https://flutter-docs-prod--pr12711-misc-widget-catalog-index-s-dzp1gfca.web.app/ui/widgets#design-systems

[gemini-code-assist]

Summary of Changes

Hello @parlough, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request streamlines the presentation of design systems on the widget catalog index page by simplifying the underlying rendering logic. It transitions from dynamic Liquid templating to static component declarations for core design system cards, making the content definition more straightforward. Additionally, it refines the styling capabilities of the generic Card component and improves Markdown link formatting for better source readability.

Highlights

• Simplified Widget Catalog Index Page: The rendering logic for the 'Design Systems' section on the widget catalog index page (src/content/ui/widgets/index.md) has been simplified by replacing a conditional Liquid templating loop with direct, inline Card component declarations for Cupertino and Material Design.
• Enhanced Card Component Styling Control: The Card component (site/lib/src/components/common/card.dart) now allows explicit control over its filled state. Previously, a card with a link was always filled; now, filled='false' can override this behavior, providing more granular styling options.
• Improved Markdown Link Readability: External links to community design systems on pub.dev within src/content/ui/widgets/index.md have been converted to use reference-style links, enhancing the readability of the Markdown source.

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[gemini-code-assist]

Code Review

This pull request simplifies the widget catalog index page by replacing a Liquid template loop with hardcoded Card components, which improves readability. The change to use reference-style links in the markdown is also a good improvement.

I've added one suggestion in site/lib/src/components/common/card.dart to improve the consistency and robustness of how boolean attributes are handled for the Card component, which is modified in this PR.

[flutter-website-bot]

Visit the preview URL for this PR (updated for commit f9afe41):

https://flutter-docs-prod--pr12711-misc-widget-catalog-index-s-dzp1gfca.web.app

[sfshaza2]

lgtm