Move lsp config to local file structure

.config/nvim/lsp/dotls.lua

@@ -0,0 +1,15 @@
+---@brief
+---
+--- https://github.com/nikeee/dot-language-server
+---
+--- `dot-language-server` can be installed via `npm`:
+--- ```sh
+--- npm install -g dot-language-server
+--- ```
+
+---@type vim.lsp.Config
+return {
+  cmd = { 'dot-language-server', '--stdio' },
+  filetypes = { 'dot' },
+  root_markers = { '.git' },
+}