Move lsp config to local file structure

.config/nvim/lsp/postgres_lsp.lua

@@ -0,0 +1,15 @@
+---@brief
+---
+--- https://pg-language-server.com
+---
+--- A collection of language tools and a Language Server Protocol (LSP) implementation for Postgres, focusing on developer experience and reliable SQL tooling.
+
+---@type vim.lsp.Config
+return {
+  cmd = { 'postgres-language-server', 'lsp-proxy' },
+  filetypes = {
+    'sql',
+  },
+  root_markers = { 'postgres-language-server.jsonc' },
+  workspace_required = true,
+}