[WIP] Skills integration

[FredKSchott]

Changes

• Proof-of-concept exploring this RFC: https://github.com/elithrar/agent-skills-discovery-rfc
• astro add skills -- Adds a new @astrojs/skills integration, letting you define Agent Skills for your project to be served publicly on your website.
• As a user, place all skills in a top-level ./skills directory in your project. Astro loads this as a content collection into your project, so that you can query it from your application code (getEntries('skills'), etc.). It then also adds a new route to automatically serve your skills at the .well-known URI path prefix. See agent-skills-discovery-rfc for more.
• Supports providing your own loader to load skills from elsewhere (ex: a different repo, if your project skills live in a seperate repo).

Testing

• Tested manually in examples/basics
• No tests added

Docs

• AI generated integration readme, needs a human pass

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Latest commit: 513290a

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[florian-lefebvre]

There is no need to have this under the official scope for now, because we then have to commit to maintenance. I think that would be good as a community package to start with, we can then reconsider based on usage