docs(rspress): add llms.txt llms-full.txt based on "@rspress/plugin-llms"

[SoonIter]

Summary

docs(rspress): add llms.txt llms-full.txt based on "@rspress/plugin-llms""

web-infra-dev/rslib#954

web-infra-dev/rsdoctor#1063

https://v2.rspress.dev/plugin/official-plugins/llms

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Checklist

• I have added changeset via pnpm run change.
• I have updated the documentation.
• I have added tests to cover my changes.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 12fc8cd

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

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[SoonIter]

https://deploy-preview-7170--modernjs-byted.netlify.app/llms.txt