docs(README): 更新项目介绍并添加多语言支持

更新了 README.md 文件中的项目标题和介绍内容,使其更加准确和吸引人。
同时添加了多语言支持的徽章,方便用户快速切换中英文版本的文档。

- 将项目标题更改为 "FFlow Next: Your First SaaS Template"
- 添加了中英文 README 切换徽章
- 移除了冗余的技术栈部分
- 添加了演示视频链接,增强项目展示效果

README.md

@@ -1,6 +1,6 @@
 <a href="https://next-saas-stripe-starter.vercel.app">
   <img alt="FFlow Next" src="public/_static/og.jpg">
-  <h1 align="center">FFlow Next SaaS Starter</h1>
+  <h1 align="center">FFlow Next: Your First SaaS Template</h1>
 </a>
 
 <p align="center">
@@ -13,17 +13,23 @@
   </a>
 </p>
 
+<p align="center">
+  <a href="./README.md"><img alt="README in English" src="https://img.shields.io/badge/English-d9d9d9"></a>
+  <a href="./README_CN.md"><img alt="简体中文版自述文件" src="https://img.shields.io/badge/简体中文-d9d9d9"></a>
+</p>
+
 <p align="center">
   <a href="#introduction"><strong>Introduction</strong></a> ·
   <a href="#installation"><strong>Installation</strong></a> ·
-  <a href="#tech-stack--features"><strong>Tech Stack + Features</strong></a> ·
   <a href="#author"><strong>Author</strong></a> ·
   <a href="#credits"><strong>Credits</strong></a>
 </p>
 <br/>
 
 ## Introduction
 
+[Click here to watch the demo video](https://app.guidde.com/share/playbooks/dCsekcnKVF3ySsS7DRHDam)
+
 Empower your next project with the stack of Next.js 14, Drizzle, Neon, Auth.js v5, Resend, React Email, Next-Intl, Shadcn/ui, and Stripe.
 
 All seamlessly integrated with the FFlow Next to accelerate your development and SaaS journey.
@@ -68,10 +74,6 @@ pnpm run dev
 - [ ] Upgrade eslint to v9
 - [ ] Add resend for success subscriptions
 
-## Tech Stack + Features
-
-https://github.com/hunterzhang86/fflow-next/assets/62285783/828a4e0f-30e3-4cfe-96ff-4dfd9cd55124
-
 ### Frameworks
 
 - [Next.js](https://nextjs.org/) – React framework for building performant apps with the best developer experience

README.zh.md → README_CN.md

@@ -1,6 +1,6 @@
 <a href="https://next-saas-stripe-starter.vercel.app">
   <img alt="FFlow Next" src="public/_static/og_zh.jpg">
-  <h1 align="center">FFlow Next SaaS 应用模版</h1>
+  <h1 align="center">FFlow Next: 您的第一个 SaaS 模板</h1>
 </a>
 
 <p align="center">
@@ -13,10 +13,14 @@
   </a>
 </p>
 
+<p align="center">
+  <a href="./README.md"><img alt="README in English" src="https://img.shields.io/badge/English-d9d9d9"></a>
+  <a href="./README_CN.md"><img alt="简体中文版自述文件" src="https://img.shields.io/badge/简体中文-d9d9d9"></a>
+</p>
+
 <p align="center">
   <a href="#introduction"><strong>介绍</strong></a> ·
   <a href="#installation"><strong>安装</strong></a> ·
-  <a href="#tech-stack--features"><strong>技术栈与功能</strong></a> ·
   <a href="#author"><strong>作者</strong></a> ·
   <a href="#credits"><strong>致谢</strong></a>
 </p>
@@ -68,10 +72,6 @@ pnpm run dev
 - [ ] 升级 eslint 到 v9
 - [ ] 添加 resend 以支持成功订阅
 
-## 技术栈与功能
-
-https://github.com/hunterzhang86/fflow-next/assets/62285783/828a4e0f-30e3-4cfe-96ff-4dfd9cd55124
-
 ### 框架
 
 - [Next.js](https://nextjs.org/) – 构建高性能应用的 React 框架，提供最佳开发体验