add vitepress docs

docs/demos/article-view/basic.vue

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+<template>
+	<div class="demo">
+		<article-view :article="article" />
+	</div>
+</template>
+
+<script lang="ts" setup>
+import { ArticleView } from "timi-tdesign-mobile";
+import type { Article } from "timi-tdesign-mobile";
+
+/** ArticleView 按 contentType 选择渲染方式，这里演示富文本形态。 */
+const article: Article = {
+	title: "文章视图",
+	contentType: "TIP_TAP",
+	content: `<h2>文章视图</h2>
+<p>正文按 <code>Article</code> 结构渲染，空内容时显示占位文案。</p>
+<blockquote><p>把 <code>contentType</code> 换成 TEXT 或 MARKDOWN 会切换渲染分支。</p></blockquote>`,
+	attachmentList: []
+};
+</script>