Add Biome to example config about kakoune-lsp HOT 2 OPEN

sure that would be welcome (commented in kak-lsp.toml, unless we make it the default).
You can directly translate the neovim config, LMK if you need help

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@krobelus it works for me using this config:

[language_server.biome]
filetypes = ["typescript", "javascript"]
roots = ["biome.json", "package.json", "tsconfig.json", "jsconfig.json", ".git", ".hg"]
command = "biome"
args = ["lsp-proxy"]

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