feat(docs): generate llms.txt and llms-full.txt

[okineadev]

This PR adds the vitepress-plugin-llms plugin to the VitePress configuration, which automatically generates LLM-Friendly documentation for the website

It generates llms.txt, llms-full.txt and an LLM-Friendly version of each page in .md format

See https://llmstxt.org

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If you accept this PR - I suggest you post a news story on your X that the site https://sli.dev/ now has documentation for LLMs and mention my plugin and me (@okineadev)

I will be grateful

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commit: e2f2f30

[okineadev]

Yikes!

[okineadev]

Hey, I can create a post myself and you can repost it on your page

But only after #2141