skills: add checkmate uptime monitoring skill

[obrera]

Adds a Checkmate skill page documenting our uptime monitoring setup.

• Why we chose Checkmate over Uptime Kuma and Kener
• API overview with key endpoints
• Monitor creation examples
• Links to repo, OpenAPI spec, and website
• Adds Checkmate to the infrastructure table on the About page
• Addresses Gemini review comment (clarify $BASE variable)

[gemini-code-assist]

Summary of Changes

Hello @obrera, 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 introduces comprehensive documentation for the Checkmate skill, which enables OpenClaw agents to manage uptime monitoring. The new page clarifies the benefits of using Checkmate over alternative solutions, outlines its core capabilities, and provides essential API details for integration and usage.

Highlights

• New Skill Documentation: Added a new documentation page for the 'Checkmate' skill, detailing its functionality and integration as an OpenClaw agent skill for uptime monitoring.
• Tool Comparison and Rationale: Included a comparison of Checkmate with other monitoring tools like Uptime Kuma and Kener, explaining why Checkmate was chosen due to its robust REST API and OpenAPI specification.
• API Overview and Examples: Provided an overview of Checkmate's API, including authentication methods, key endpoints, and an example for creating an HTTP monitor.

Changelog

• src/content/docs/skills/checkmate.md
  • Added a new documentation page for the Checkmate skill.
  • Included a comparison table of monitoring tools.
  • Detailed Checkmate's API overview, including authentication and key endpoints.
  • Provided an example for creating an HTTP monitor.

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[gemini-code-assist]

Code Review

This pull request introduces documentation for a new 'Checkmate' skill. The document is well-written and provides a good overview of the skill's purpose and API. I've added one suggestion to improve the clarity of a code example.

A crucial point to address is that the new skill page is not linked from the skills index page (src/content/docs/skills/index.md). This will make the new documentation undiscoverable. Please remember to add a link to the new page in the index file to ensure users can find it.