Move lsp config to local file structure

.config/nvim/lsp/purescriptls.lua

@@ -0,0 +1,15 @@
+---@brief
+---
+--- https://github.com/nwolverson/purescript-language-server
+---
+--- The `purescript-language-server` can be added to your project and `$PATH` via
+---
+--- * JavaScript package manager such as npm, pnpm, Yarn, et al.
+--- * Nix under the `nodePackages` and `nodePackages_latest` package sets
+
+---@type vim.lsp.Config
+return {
+  cmd = { 'purescript-language-server', '--stdio' },
+  filetypes = { 'purescript' },
+  root_markers = { 'bower.json', 'flake.nix', 'psc-package.json', 'shell.nix', 'spago.dhall', 'spago.yaml' },
+}