Broken / outdated link to Julia Style Guide (docs/style-guides/julia/README.md)

### Description

The link to the Julia style guide appears to be broken or outdated.

Specifically, the path:

stdlib/docs/style-guides/julia/README.md

does not resolve to a valid file anymore. The page references a "Julia Style Guide" with a TODO, but the link itself is not accessible.

The link does not work and results in a missing file / dead reference

It’s unclear whether the Julia style guide was intentionally removed or never finalized.

Happy to help with a fix or PR if guidance is provided.