Add zk to example config

[notramo]

zk is a CLI tool for managing Zettelkasten notes.
It should be configured to markdown filetype.
It has a .zk directory in the project root.
https://github.com/zk-org/zk/blob/main/docs/editors-integration.md

[notramo]

Here is a code snippet that works for me.

[language_server.zk]
filetypes = ["markdown"]
roots = [".zk"]
command = "zk"
args = ["lsp"]

[uncomfyhalomacro]

tbh, the completion will start after typing [[ and deleting it by backspacing twice @notramo or is it just me?

[notramo]

I think it's a bug in zk, the latest release has some fixes regarding completion, but I don't know if this particular issue is fixed or not.
zk-org/zk#397

[uncomfyhalomacro]

i don't think so. there is a similar completion bug about unicode latex symbols completion in Julia here. because completions work on Helix just fine.