chore: move docs demo app to root folder

demo/index.ts

@@ -1,8 +1,8 @@
 import { createApp } from 'vue'
 
 import { vMaska } from '..'
-import Demo from './Demo.vue'
+import App from './App.vue'
 
-createApp(Demo)
+createApp(App)
   .directive('maska', vMaska)
   .mount('#demo-app')

src/demo/vite-env.d.ts

@@ -1,5 +0,0 @@
-declare module '*.vue' {
-  import type { DefineComponent } from 'vue'
-  const component: DefineComponent<{}, {}, any>
-  export default component
-}

vite.config.demo.ts

@@ -7,7 +7,7 @@ export default defineConfig({
     outDir: 'docs/dist',
     rollupOptions: {
       input: {
-        demo: 'src/demo/demo.ts'
+        demo: 'demo/index.ts'
       },
       output: {
         entryFileNames: '[name].js',