Add Permaweb LLMs.txt iframe and Update LLMs Documentation Files

[dpshade]

Overview

This PR introduces the following changes compared to the main branch:

Embeded Permaweb LLMs.txt Builder Tool:

• Added a new section to src/llms-explanation.md that introduces and embeds the Permaweb LLMs.txt Builder Tool.
• The embed includes both light and dark mode iframes, with appropriate CSS to toggle visibility based on the user's theme.

Details

• The new section in llms-explanation.md provides users with a direct, interactive way to build custom LLMs.txt files from Permaweb ecosystem docs.
• The iframe embed is responsive and theme-aware, ensuring a seamless user experience in both light and dark modes.
• The LLMs documentation files have been regenerated to reflect the latest content and generation timestamps.

Motivation

• Improves discoverability and usability of the Permaweb LLMs.txt builder for users of the ao Cookbook.
• Keeps LLMs documentation up to date for all supported languages.