Move lsp config to local file structure

.config/nvim/lsp/grammarly.lua

@@ -0,0 +1,26 @@
+---@brief
+---
+--- https://github.com/znck/grammarly
+---
+--- `grammarly-languageserver` can be installed via `npm`:
+---
+--- ```sh
+--- npm i -g grammarly-languageserver
+--- ```
+---
+--- WARNING: Since this language server uses Grammarly's API, any document you open with it running is shared with them. Please evaluate their [privacy policy](https://www.grammarly.com/privacy-policy) before using this.
+
+---@type vim.lsp.Config
+return {
+  cmd = { 'grammarly-languageserver', '--stdio' },
+  filetypes = { 'markdown' },
+  root_markers = { '.git' },
+  handlers = {
+    ['$/updateDocumentState'] = function()
+      return ''
+    end,
+  },
+  init_options = {
+    clientId = 'client_BaDkMgx4X19X9UxxYRCXZo',
+  },
+}