Move lsp config to local file structure

.config/nvim/lsp/gleam.lua

@@ -0,0 +1,14 @@
+---@brief
+---
+--- https://github.com/gleam-lang/gleam
+---
+--- A language server for Gleam Programming Language.
+---
+--- It comes with the Gleam compiler, for installation see: [Installing Gleam](https://gleam.run/getting-started/installing/)
+
+---@type vim.lsp.Config
+return {
+  cmd = { 'gleam', 'lsp' },
+  filetypes = { 'gleam' },
+  root_markers = { 'gleam.toml', '.git' },
+}