update readme links

Author: yyx990803

README.md

@@ -1,6 +1,6 @@
 # v3.vuejs.org
 
-This site is built with [VuePress](https://vuepress.vuejs.org/). Site content is written in Markdown format located in `src`.
+This site is built with [VitePress](https://github.com/vuejs/vitepress). Site content is written in Markdown format located in `src`.
 
 ## Writing
 
@@ -11,7 +11,7 @@ See the [Vue Docs Writing Guide](https://v3.vuejs.org/guide/writing-guide.html)
 1. Clone repository
 
 ```bash
-git clone [email protected]:vuejs/docs-next.git
+git clone [email protected]:vuejs/docs.git
 ```
 
 2. Install dependencies