Move lsp config to local file structure

.config/nvim/lsp/bqls.lua

@@ -0,0 +1,17 @@
+---@brief
+---
+--- https://github.com/kitagry/bqls
+---
+--- The `bqls` BigQuery language server can be installed by running:
+---
+--- ```sh
+--- $ go install github.com/kitagry/bqls@latest
+--- ```
+
+---@type vim.lsp.Config
+return {
+  cmd = { 'bqls' },
+  filetypes = { 'sql' },
+  root_markers = { '.git' },
+  settings = {},
+}