Add support for llm.txt

[ipfans]

The llm.txt offers a user-friendly approach to using LLMs.(Example: anthropic's llm-full.txt) It's particularly convenient for AI Coders like Cursor, Windsurf, GitHub Copilot, and Cline, as it simplifies accessing the latest APIs and relevant knowledge. We do not need worry about the update time of the LLM's knowledge base. Being out of date is a common issue for LLMs. The "llm.txt" file serves as a more stable convention for embedding within the context of LLMs, thereby alleviating our reliance on the LLM's knowledge base updates.

More often than not, manually managing the llm.txt file incurs additional costs for users. Official support for this feature would undoubtedly be a significant help for those using AI in development activities. Especially with Chakra UI having already made that attempt (link). as a NextUI user, I eagerly hope for similar support from NextUI.