Move lsp config to local file structure

.config/nvim/lsp/twiggy_language_server.lua

@@ -0,0 +1,15 @@
+---@brief
+---
+--- https://github.com/moetelo/twiggy
+---
+--- `twiggy-language-server` can be installed via `npm`:
+--- ```sh
+--- npm install -g twiggy-language-server
+--- ```
+
+---@type vim.lsp.Config
+return {
+  cmd = { 'twiggy-language-server', '--stdio' },
+  filetypes = { 'twig' },
+  root_markers = { 'composer.json', '.git' },
+}