Support for llms.txt (an index of publicly available markdown files) as a content source for Fin

Many companies are now providing llms.txt for their documentation to make it more efficient for agents to consume content. It’s an index of publicly available markdown files.  See, for example, https://cloudinary.com/documentation/llms.txt. If Fin supported this as a content source (or even just markdown files as a source) it would really help us, as the markdown files contain all code examples, and expand content that’s in collapsed sections - content that’s not accessible directly from the HTML.