feat: add llms.txt v2 support

[albertoivo]

Implemented the llms.txt v2 specification by creating public/llms.txt with relevant project information, sections, and markdown links. Also updated index.html with a <link rel="describedby"> tag. Tested and built the project successfully.

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PR created automatically by Jules for task 4469274617381549752 started by @albertoivo

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Visit the preview URL for this PR (updated for commit d6c8fee):

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