Move lsp config to local file structure

.config/nvim/lsp/ecsact.lua

@@ -0,0 +1,15 @@
+---@brief
+---
+--- https://github.com/ecsact-dev/ecsact_lsp_server
+---
+--- Language server for Ecsact.
+---
+--- The default cmd assumes `ecsact_lsp_server` is in your PATH. Typically from the
+--- Ecsact SDK: https://ecsact.dev/start
+
+---@type vim.lsp.Config
+return {
+  cmd = { 'ecsact_lsp_server', '--stdio' },
+  filetypes = { 'ecsact' },
+  root_markers = { '.git' },
+}