Move lsp config to local file structure

.config/nvim/lsp/m68k.lua

@@ -0,0 +1,24 @@
+---@brief
+---
+--- https://github.com/grahambates/m68k-lsp
+---
+--- Language server for Motorola 68000 family assembly
+---
+--- `m68k-lsp-server` can be installed via `npm`:
+---
+--- ```sh
+--- npm install -g m68k-lsp-server
+--- ```
+---
+--- Ensure you are using the 68k asm syntax variant in Neovim.
+---
+--- ```lua
+--- vim.g.asmsyntax = 'asm68k'
+--- ```
+
+---@type vim.lsp.Config
+return {
+  cmd = { 'm68k-lsp-server', '--stdio' },
+  filetypes = { 'asm68k' },
+  root_markers = { 'Makefile', '.git' },
+}