fix(submodule): remove playground so can be used as submodule

.playground/nuxt.config.ts

@@ -1,15 +0,0 @@
-import { fileURLToPath } from 'node:url'
-
-export default defineNuxtConfig({
-  extends: ['..'],
-  modules: ['@nuxt/eslint'],
-
-  eslint: {
-    config: {
-      // Use the generated ESLint config for lint root project as well
-      rootDir: fileURLToPath(new URL('..', import.meta.url))
-    }
-  },
-
-  compatibilityDate: '2024-12-24'
-})

tsconfig.json

@@ -1,3 +0,0 @@
-{
-  "extends": "./.playground/.nuxt/tsconfig.json"
-}