Move lsp config to local file structure

.config/nvim/lsp/hlasm.lua

@@ -0,0 +1,12 @@
+---@brief
+---
+--- `hlasm_language_server` is a language server for the High Level Assembler language used on IBM SystemZ mainframes.
+---
+--- To learn how to configure the HLASM language server, see the [HLASM Language Support documentation](https://github.com/eclipse-che4z/che-che4z-lsp-for-hlasm).
+
+---@type vim.lsp.Config
+return {
+  cmd = { 'hlasm_language_server' },
+  filetypes = { 'hlasm' },
+  root_markers = { '.hlasmplugin' },
+}