docs: use vitepress

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

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+<script setup>
+import { useVueFlow } from '@braks/vue-flow'
+
+const flowKey = 'example-flow'
+
+const { nodes, addNodes, setNodes, setEdges, dimensions, setTransform, toObject } = useVueFlow()
+
+const onSave = () => {
+  localStorage.setItem(flowKey, JSON.stringify(toObject()))
+}
+
+const onRestore = () => {
+  const flow = JSON.parse(localStorage.getItem(flowKey))
+
+  if (flow) {
+    const [x = 0, y = 0] = flow.position
+    setNodes(flow.nodes)
+    setEdges(flow.edges)
+    setTransform({ x, y, zoom: flow.zoom || 0 })
+  }
+}
+
+const onAdd = () => {
+  const id = nodes.value.length + 1
+  const newNode = {
+    id: `random_node-${id}`,
+    label: `Node ${id}`,
+    position: { x: Math.random() * dimensions.value.width, y: Math.random() * dimensions.value.height },
+  }
+  addNodes([newNode])
+}
+</script>
+
+<template>
+  <div class="save__controls">
+    <button style="background-color: #33a6b8" @click="onSave">save</button>
+    <button style="background-color: #113285" @click="onRestore">restore</button>
+    <button style="background-color: #6f3381" @click="onAdd">add node</button>
+  </div>
+</template>