Update example

example/src/App.vue

 <script setup>
 import Grid from "../../src/Grid.vue";
-import DragContainer from "../../src/DragContainer.vue";
 </script>
 
 <template>
   <div id="app">
     <Grid :rows="10" :cols="5"></Grid>
-    <DragContainer></DragContainer>
   </div>
 </template>