Reference external documentation

[iloveitaly]

Is your feature request related to a problem? Please describe:
Yes, I want to use a recently developed package that isn't well known by LLMs, such as

https://www.assistant-ui.com/docs/getting-started

Describe the solution you'd like:

I'd like to be able to instruct bolt to read the documentation for that tool @url https://www.assistant-ui.com/docs/getting-started and use that as part of it's chat context.

Describe alternatives you've considered:

I've pasted in readmes of a package and that works well for simple packages. For more complex packages with multi-page documentation, this does not work as well.