docs: use vitepress

docs2/components/examples/save-restore/App.vue

@@ -0,0 +1,13 @@
+<script lang="ts" setup>
+import { VueFlow } from '@braks/vue-flow'
+import { ref } from 'vue'
+import Controls from './Controls.vue'
+
+const elements = ref([{ id: '1', label: 'Node 1', position: { x: 100, y: 100 } }])
+</script>
+
+<template>
+  <VueFlow v-model="elements">
+    <Controls />
+  </VueFlow>
+</template>