Move lsp config to local file structure

.config/nvim/lsp/openscad_lsp.lua

@@ -0,0 +1,17 @@
+---@brief
+---
+--- https://github.com/Leathong/openscad-LSP
+---
+--- A Language Server Protocol server for OpenSCAD
+---
+--- You can build and install `openscad-lsp` binary with `cargo`:
+--- ```sh
+--- cargo install openscad-lsp
+--- ```
+
+---@type vim.lsp.Config
+return {
+  cmd = { 'openscad-lsp', '--stdio' },
+  filetypes = { 'openscad' },
+  root_markers = { '.git' },
+}