Move lsp config to local file structure

.config/nvim/lsp/scheme_langserver.lua

@@ -0,0 +1,15 @@
+---@brief
+---
+--- https://github.com/ufo5260987423/scheme-langserver
+--- `scheme-langserver`, a language server protocol implementation for scheme.
+--- And for nvim user, please add .sls to scheme file extension list.
+
+---@type vim.lsp.Config
+return {
+  cmd = { 'scheme-langserver', '~/.scheme-langserver.log', 'enable', 'disable' },
+  filetypes = { 'scheme' },
+  root_markers = {
+    'Akku.manifest',
+    '.git',
+  },
+}