Update to github

{
  "official": [
    {
      "name": "github",
      "source": "./external_plugins/github",
      "category": "productivity",
      "homepage": "https://github.com/anthropics/claude-plugins-public/tree/main/external_plugins/github",
      "description": "Official GitHub MCP server for repository management. Create issues, manage pull requests, review code, search repositories, and interact with GitHub's full API directly from Claude Code."
    }
  ]
}