Include page title and description in md output

[parlough]

Includes the page title and description (if present) in the secondary Markdown output for each page.

Staged example: https://flutter-docs-prod--pr12639-feat-header-in-markdown-out-0w19b91b.web.app/ui/layout/tutorial/index.html.md

[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 enhances the site's content generation by ensuring that page titles and descriptions are automatically included in the secondary Markdown output, improving the readability and context of generated documentation. It also includes a minor refactoring of a core component and updates various package dependencies to maintain compatibility and leverage the latest features and fixes.

Highlights

• Markdown Output Enhancement: The generated Markdown output for each page now includes the page's title as an H1 heading and its description as a blockquote, if these properties are present in the page data.
• Component Refactoring: The DashTabs component has been refactored to extend CustomComponent instead of implementing it, along with an update to its constructor.
• Dependency Updates: Several project dependencies, including crypto, jaspr_content, build_web_compilers, and sass, have been updated to their latest versions.

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[gemini-code-assist]

Code Review

This pull request updates dependencies and adds a feature to include the page title and description in the secondary Markdown output. The implementation for adding the header is mostly correct, but I've suggested a small improvement to make it more robust by handling cases where a page might have a description but no title. The other changes are dependency updates which look fine.

[flutter-website-bot]

Visit the preview URL for this PR (updated for commit e8c999e):

https://flutter-docs-prod--pr12639-feat-header-in-markdown-out-0w19b91b.web.app

[sfshaza2]

lgtm