Move lsp config to local file structure

.config/nvim/lsp/hie.lua

@@ -0,0 +1,25 @@
+---@brief
+---
+--- https://github.com/haskell/haskell-ide-engine
+---
+--- the following init_options are supported (see https://github.com/haskell/haskell-ide-engine#configuration):
+--- ```lua
+--- init_options = {
+---   languageServerHaskell = {
+---     hlintOn = bool;
+---     maxNumberOfProblems = number;
+---     diagnosticsDebounceDuration = number;
+---     liquidOn = bool (default false);
+---     completionSnippetsOn = bool (default true);
+---     formatOnImportOn = bool (default true);
+---     formattingProvider = string (default "brittany", alternate "floskell");
+---   }
+--- }
+--- ```
+
+---@type vim.lsp.Config
+return {
+  cmd = { 'hie-wrapper', '--lsp' },
+  filetypes = { 'haskell' },
+  root_markers = { 'stack.yaml', 'package.yaml', '.git' },
+}