Move lsp config to local file structure

.config/nvim/lsp/tabby_ml.lua

@@ -0,0 +1,18 @@
+---@brief
+---
+--- https://tabby.tabbyml.com/blog/running-tabby-as-a-language-server
+---
+--- Language server for Tabby, an opensource, self-hosted AI coding assistant.
+---
+--- `tabby-agent` can be installed via `npm`:
+---
+--- ```sh
+--- npm install --global tabby-agent
+--- ```
+
+---@type vim.lsp.Config
+return {
+  cmd = { 'tabby-agent', '--lsp', '--stdio' },
+  filetypes = {},
+  root_markers = { '.git' },
+}