Move lsp config to local file structure

.config/nvim/lsp/motoko_lsp.lua

@@ -0,0 +1,15 @@
+---@brief
+---
+--- https://github.com/dfinity/vscode-motoko
+---
+--- Language server for the Motoko programming language.
+
+---@type vim.lsp.Config
+return {
+  cmd = { 'motoko-lsp', '--stdio' },
+  filetypes = { 'motoko' },
+  root_markers = { 'dfx.json', '.git' },
+  init_options = {
+    formatter = 'auto',
+  },
+}