Fix a few unmigrated Liquid usages

[parlough]

These must have accidentally got missed around when we were merging the Jaspr migration in.

Staged: https://flutter-docs-prod--pr12708-fix-unmigrated-liquid-usage-68fnf0c5.web.app/ui/accessibility/assistive-technologies#screen-readers

[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 completes the migration from Liquid templating to Jaspr components for specific UI elements, addressing previously unmigrated instances of tabs and YouTube embeds. The changes ensure that the content rendering aligns fully with the Jaspr framework. Additionally, a minor CSS adjustment was made to improve the spacing within tab panes, and the associated style hash was updated.

Highlights

• Liquid to Jaspr Migration: Migrated all remaining Liquid {% tabs %}, {% tab %}, and {% ytEmbed %} syntax to their corresponding Jaspr <Tabs>, <Tab>, and <YouTubeEmbed /> components in markdown content files.
• CSS Styling Adjustment: Added a margin-block-end of 1rem to the last child element within tab panes to ensure consistent spacing and visual presentation.
• Style Hash Update: Updated the generatedStylesHash constant in style_hash.dart to reflect the latest changes in the main.css file, likely due to the CSS styling adjustment.

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[gemini-code-assist]

Code Review

This pull request effectively continues the migration from Liquid tags to Jaspr components by updating several markdown files. The changes correctly replace {% tabs %} and {% ytEmbed %} with their <Tabs> and <YouTubeEmbed> counterparts. Additionally, a related SCSS improvement for the tabs component enhances spacing, and the corresponding style hash is updated. My review includes a couple of minor suggestions to improve content consistency in one of the updated markdown files.

[flutter-website-bot]

Visit the preview URL for this PR (updated for commit 937dbba):

https://flutter-docs-prod--pr12708-fix-unmigrated-liquid-usage-68fnf0c5.web.app

[sfshaza2]

lgtm