docs: use vitepress

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

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+<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>

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>

docs2/components/examples/save-restore/index.ts

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+export { default as SaveRestoreApp } from './App.vue?raw'
+export { default as SaveRestoreControls } from './Controls.vue?raw'
+export { default as SaveRestoreCSS } from './style.css'

docs2/components/examples/save-restore/style.css

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+.save__controls {
+  position: absolute;
+  left: 10px;
+  top: 10px;
+  z-index: 4;
+  font-size: 12px;
+}
+
+.save__controls button {
+  margin-left: 5px;
+  padding: 5px;
+  border-radius: 5px;
+  font-weight: 700;
+  text-transform: uppercase;
+  color: white;
+  -webkit-box-shadow: 0px 5px 10px 0px rgba(0,0,0,0.3);
+  box-shadow: 0px 5px 10px 0px rgba(0,0,0,0.3);
+  cursor: pointer;
+}
+
+.save__controls button:hover {
+  opacity: 0.8;
+  transform: scale(105%);
+  transition: 250ms all ease-in-out;
+}