docs: use vitepress

docs2/components/examples/validation/CustomInput.vue

@@ -0,0 +1,21 @@
+<script setup>
+import { Handle, Position } from '@braks/vue-flow'
+
+const props = defineProps({
+  isValidTargetPos: {
+    type: Function,
+    required: false,
+  },
+})
+</script>
+
+<script>
+export default {
+  inheritAttrs: false,
+}
+</script>
+
+<template>
+  <div>Only connectable with B</div>
+  <Handle type="source" :position="Position.Right" :is-valid-connection="props.isValidTargetPos" />
+</template>