Collect AI-related content together and standardize titles

[parlough]

• Collocates the various AI-related top-level directories under the top-level /ai directory.
• Adds an auto-generated index page at /ai.
• Removes the /resources/ai-overview page that isn't linked to and is covered by /ai/create-with-ai.
• Renames /ai/flutter-ext-for-gemini to /ai/gemini-cli-extension to be more accurate and avoid duplication in the path.
• Updates a few titles to use sentence case as expected by site standards.
• Adds some custom short titles and breadcrumbs for improved site navigation and contextualization.

[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 significantly refactors the site's AI-related documentation by centralizing all relevant content under a new /ai top-level directory. The changes aim to enhance content organization, improve navigation through standardized titles and new index pages, and ensure a seamless user experience by implementing comprehensive URL redirects for all moved and renamed pages. This consolidation makes it easier for users to find and access information about AI integration with Flutter.

Highlights

• AI Content Collocation: All AI-related top-level directories have been consolidated under a new, unified /ai directory to improve organization and discoverability.
• New AI Index Page: An auto-generated index page has been added at /ai to provide a central entry point for all AI-related content.
• Page Removal and Redirection: The /resources/ai-overview page, which was unlinked and redundant, has been removed and its content is now covered by /ai/create-with-ai with appropriate redirects.
• Path and Title Standardization: The path /ai/flutter-ext-for-gemini has been renamed to /ai/gemini-cli-extension for accuracy and to avoid duplication. Additionally, several page titles have been updated to use sentence case, and custom short titles and breadcrumbs have been added for improved site navigation.
• URL Redirections: The firebase.json configuration has been updated with 301 redirects to ensure that old URLs for moved and renamed AI-related content continue to function correctly, pointing to their new locations.

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[gemini-code-assist]

Code Review

This pull request reorganizes and updates the documentation structure for AI-related content, primarily by moving existing AI documentation paths under a consistent /ai/ prefix (e.g., /ai/best-practices, /ai/ai-toolkit). This involved adding new 301 redirects in firebase.json for these updated paths, updating numerous internal links within markdown files (e.g., src/content/ai/ai-toolkit/*.md, src/content/ai/best-practices/*.md), and restructuring the sidebar navigation in src/data/sidenav.yml to reflect these changes. Additionally, a new top-level AI overview page (src/content/ai/index.md) was introduced, replacing a previous version, and shortTitle frontmatter was added to several AI-related markdown files. Review comments highlighted an incorrect redirect destination in firebase.json for tool-calls-aka-function-calls, an inconsistent short-title key in src/content/ai/best-practices/index.md that should be shortTitle, and suggested updating a Flutter AI Toolkit link in src/content/ai/create-with-ai.md to use its direct, final path to avoid a redirect.

[flutter-website-bot]

Visit the preview URL for this PR (updated for commit 9e4fc6e):

https://flutter-docs-prod--pr12895-feat-ai-directory-cleanup-lng61chn.web.app

[sfshaza2]

"/ai/ai-toolkit/..." is not the most elegant of urls, but ok.