Create llms.txt and llms-full.txt

[higumachan]

@ealmloff

This issue is continuation of the following https://github.com/DioxusLabs/dioxus/discussions/3780 .

I felt that this discussion was well received, so I created an mdBook renderer: mdbook-llms-txt-tools. Using this, I would like to proceed with supporting llms.txt in this repository.

[ealmloff]

We use our own version of mdbook that expands to rsx macros called include_mdbook. The format very similar to include mdbook, but I don't know if the original mdbook parser will work with our markdown source anymore