Move lsp config to local file structure

.config/nvim/lsp/cucumber_language_server.lua

@@ -0,0 +1,19 @@
+---@brief
+---
+--- https://cucumber.io
+--- https://github.com/cucumber/common
+--- https://www.npmjs.com/package/@cucumber/language-server
+---
+--- Language server for Cucumber.
+---
+--- `cucumber-language-server` can be installed via `npm`:
+--- ```sh
+--- npm install -g @cucumber/language-server
+--- ```
+
+---@type vim.lsp.Config
+return {
+  cmd = { 'cucumber-language-server', '--stdio' },
+  filetypes = { 'cucumber' },
+  root_markers = { '.git' },
+}