Read local/relative markdown files support

[linux-china]

Now llms_txt2ctx only supports to read http:// or https:// links, any idea to read relative markdown files? When editing llms.txt, relative files are friendly for IDE/Editor. It's is also friendly to convert local llms.txt to llms.md, and attach llms.md to chat bot.

# zawk

> zawk is an implementation of the AWK language written by Rust, and it includes a standard library for text, math,
> datetime, crypto, parser, encode/decode, KV, SQLite/MySQL, Redis/NATS, etc.

## Docs

- [FAQ](./info/faq.md): FAQ about zawk