Toolchains

1st chunk of `doc/toolchains.md`

37ec8d2ac647ed7e9420bfe2d02f1d809551636ed215851f0000000100000058

# Toolchains {#part-toolchains}

```{=include=} chapters
toolchains/llvm.chapter.md
```

Title: Toolchains

Summary

This section introduces the concept of toolchains and includes content from the `llvm.chapter.md` file, indicating that it will cover LLVM as a specific toolchain example.