migrate-skills-yaml

Old format (single flat file)

shared_docs:
  - https://posthog.com/docs/getting-started/identify-users.md

skills:
  - id: nextjs-app-router
    type: example
    example_paths: basics/next-app-router
    display_name: Next.js App Router
    description: PostHog integration for Next.js App Router applications
    tags: [nextjs, react, ssr, app-router, javascript]
    docs_urls:
      - https://posthog.com/docs/libraries/next-js.md

  - id: react