feat: publicize doc implemetation

one/docs/demo/popover/ui.vue

@@ -0,0 +1,64 @@
+<template>
+<article>
+  <section>
+    <veui-select
+      v-model="ui"
+      :options="options"
+    />
+    <veui-button @click="reset">
+      reset
+    </veui-button>
+  </section>
+  <section>
+    <span ref="text">Move your mouse pointer over here.</span>
+    <veui-popover
+      :ui="ui"
+      target="text"
+    >
+      This is a popover.
+    </veui-popover>
+  </section>
+</article>
+</template>
+
+<script>
+import { Popover, Select, Button } from 'veui'
+
+export default {
+  components: {
+    'veui-select': Select,
+    'veui-button': Button,
+    'veui-popover': Popover
+  },
+  data () {
+    return {
+      ui: null,
+      options: [
+        {
+          label: 's',
+          value: 's'
+        },
+        {
+          label: 'm',
+          value: 'm'
+        }
+      ]
+    }
+  },
+  methods: {
+    reset () {
+      this.ui = null
+    }
+  }
+}
+</script>
+
+<style lang="less" scoped docs>
+section + section {
+  margin-top: 20px;
+}
+.veui-select {
+  max-width: 120px;
+  margin-right: 10px;
+}
+</style>