Move lsp config to local file structure

.config/nvim/lsp/spectral.lua

@@ -0,0 +1,22 @@
+---@brief
+---
+--- https://github.com/luizcorreia/spectral-language-server
+---  `A flexible JSON/YAML linter for creating automated style guides, with baked in support for OpenAPI v2 & v3.`
+---
+--- `spectral-language-server` can be installed via `npm`:
+--- ```sh
+--- npm i -g spectral-language-server
+--- ```
+--- See [vscode-spectral](https://github.com/stoplightio/vscode-spectral#extension-settings) for configuration options.
+
+---@type vim.lsp.Config
+return {
+  cmd = { 'spectral-language-server', '--stdio' },
+  filetypes = { 'yaml', 'json', 'yml' },
+  root_markers = { '.spectral.yaml', '.spectral.yml', '.spectral.json', '.spectral.js' },
+  settings = {
+    enable = true,
+    run = 'onType',
+    validateLanguages = { 'yaml', 'json', 'yml' },
+  },
+}