Move lsp config to local file structure

.config/nvim/lsp/snakeskin_ls.lua

@@ -0,0 +1,15 @@
+---@brief
+---
+--- https://www.npmjs.com/package/@snakeskin/cli
+---
+--- `snakeskin cli` can be installed via `npm`:
+--- ```sh
+--- npm install -g @snakeskin/cli
+--- ```
+
+---@type vim.lsp.Config
+return {
+  cmd = { 'snakeskin-cli', 'lsp', '--stdio' },
+  filetypes = { 'ss' },
+  root_markers = { 'package.json' },
+}