Move lsp config to local file structure

.config/nvim/lsp/sqls.lua

@@ -0,0 +1,19 @@
+---@brief
+---
+--- https://github.com/sqls-server/sqls
+---
+--- ```lua
+--- vim.lsp.config('sqls', {
+---   cmd = {"path/to/command", "-config", "path/to/config.yml"};
+---   ...
+--- })
+--- ```
+--- Sqls can be installed via `go install github.com/sqls-server/sqls@latest`. Instructions for compiling Sqls from the source can be found at [sqls-server/sqls](https://github.com/sqls-server/sqls).
+
+---@type vim.lsp.Config
+return {
+  cmd = { 'sqls' },
+  filetypes = { 'sql', 'mysql' },
+  root_markers = { 'config.yml' },
+  settings = {},
+}