Document Aspire skills

[davidfowl]

Summary

• Add a top-level Aspire skills documentation page for AI coding agents.
• Update AI coding-agent, MCP, dashboard, first-app, and CLI reference docs to use Aspire skills terminology.
• Position Aspire skills as the preferred workflow guidance and Aspire MCP as the live runtime data companion.

Validation

• Compared against origin/release/13.4: 8 files changed.
• No origin/main merge included.

[Copilot]

Pull request overview

This PR adds dedicated documentation for Aspire skills and updates related AI agent, MCP, dashboard, first-app, and CLI reference docs to use the new skills terminology consistently.

Changes:

• Adds a new Aspire skills get-started page covering installation, available skills, locations, migration, and MCP positioning.
• Updates AI coding-agent docs to reference Aspire skills as workflow guidance and Playwright CLI as a companion tool.
• Adds sidebar navigation and cross-links from MCP, dashboard, first-app, and CLI reference pages.

Show a summary per file

File	Description
src/frontend/src/content/docs/get-started/aspire-skills.mdx	Adds the new top-level Aspire skills documentation page.
src/frontend/src/content/docs/get-started/ai-coding-agents.mdx	Reworks AI agent setup guidance around Aspire skills and Playwright CLI.
src/frontend/src/content/docs/get-started/aspire-mcp-server.mdx	Adds skills-first positioning and a see-also link.
src/frontend/src/content/docs/get-started/first-app.mdx	Updates AI agent setup wording from skill file to Aspire skills.
src/frontend/src/content/docs/dashboard/ai-coding-agents.mdx	Updates the skill guidance link to the new page.
src/frontend/src/content/docs/reference/cli/commands/aspire-agent.mdx	Updates command description terminology.
src/frontend/src/content/docs/reference/cli/commands/aspire-agent-init.mdx	Updates init flow and --skills option descriptions.
src/frontend/config/sidebar/docs.topics.ts	Adds the new Aspire skills page to the docs sidebar.

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• Files reviewed: 8/8 changed files
• Comments generated: 0