Move lsp config to local file structure

.config/nvim/lsp/unison.lua

@@ -0,0 +1,16 @@
+---@brief
+---
+--- https://github.com/unisonweb/unison/blob/trunk/docs/language-server.markdown
+
+local util = require 'lspconfig.util'
+
+---@type vim.lsp.Config
+return {
+  cmd = { 'nc', 'localhost', os.getenv 'UNISON_LSP_PORT' or '5757' },
+  filetypes = { 'unison' },
+  root_dir = function(bufnr, on_dir)
+    local fname = vim.api.nvim_buf_get_name(bufnr)
+    on_dir(util.root_pattern('*.u')(fname))
+  end,
+  settings = {},
+}