Move lsp config to local file structure

.config/nvim/lsp/racket_langserver.lua

@@ -0,0 +1,16 @@
+---@brief
+---
+--- [https://github.com/jeapostrophe/racket-langserver](https://github.com/jeapostrophe/racket-langserver)
+---
+--- The Racket language server. This project seeks to use
+--- [DrRacket](https://github.com/racket/drracket)'s public API to provide
+--- functionality that mimics DrRacket's code tools as closely as possible.
+---
+--- Install via `raco`: `raco pkg install racket-langserver`
+
+---@type vim.lsp.Config
+return {
+  cmd = { 'racket', '--lib', 'racket-langserver' },
+  filetypes = { 'racket', 'scheme' },
+  root_markers = { '.git' },
+}