Move lsp config to local file structure

.config/nvim/lsp/aiken.lua

@@ -0,0 +1,15 @@
+---@brief
+---
+--- https://github.com/aiken-lang/aiken
+---
+--- A language server for Aiken Programming Language.
+--- [Installation](https://aiken-lang.org/installation-instructions)
+---
+--- It can be i
+
+---@type vim.lsp.Config
+return {
+  cmd = { 'aiken', 'lsp' },
+  filetypes = { 'aiken' },
+  root_markers = { 'aiken.toml', '.git' },
+}