add CDN tips

examples/docs/en-US/installation.md

@@ -3,8 +3,12 @@
 ### npm
 Installing with npm is recommended and it works seamlessly with [webpack](https://webpack.js.org/).
 
+:::tip
+Note that this doc is for 1.x, so you need the `legacy` tag when installing.
+:::
+
 ```shell
-npm i element-ui -S
+npm i element-ui@legacy -S
 ```
 
 ### CDN
@@ -17,6 +21,10 @@ Get the latest version from [unpkg.com/element-ui](https://unpkg.com/element-ui@
 <script src="https://unpkg.com/element-ui@1.4/lib/index.js"></script>
 ```
 
+:::tip
+We recommend our users to lock Element's version when using CDN. For example, if you're using Element 1.4.8, you can lock CSS and JavaScript files like this: `https://unpkg.com/element-ui@1.4.8/lib/theme-default/index.css`, `https://unpkg.com/element-ui@1.4.8/lib/index.js`.
+:::
+
 ### Hello world
 If you are using CDN, a hello-world page is easy with Element. [Online Demo](https://jsfiddle.net/hzfpyvg6/18/)
 
@@ -37,7 +45,7 @@ If you are using CDN, a hello-world page is easy with Element. [Online Demo](htt
   </div>
 </body>
   <!-- import Vue before Element -->
-  <script src="https://unpkg.com/vue/dist/vue.js"></script>
+  <script src="https://unpkg.com/vue@2.5/dist/vue.js"></script>
   <!-- import JavaScript -->
   <script src="https://unpkg.com/element-ui@1.4/lib/index.js"></script>
   <script>

examples/docs/en-US/quickstart.md

@@ -4,7 +4,7 @@ This part walks you through the process of using Element in a webpack project.
 
 ### Use Starter Kit
 
-We provide a general [project template](https://github.com/ElementUI/element-starter) for you. For those who are familiar with [cooking](https://github.com/ElementUI/element-cooking-starter) or [Laravel](https://github.com/ElementUI/element-in-laravel-starter), we also provide corresponding templates, and you can download and use them as well.
+We provide a general [project template](https://github.com/ElementUI/element-starter/tree/1.x) for you. For those who are familiar with [cooking](https://github.com/ElementUI/element-cooking-starter) or [Laravel](https://github.com/ElementUI/element-in-laravel-starter/tree/1.x), we also provide corresponding templates, and you can download and use them as well.
 
 If you prefer not to use them, please read the following.
 
@@ -42,8 +42,8 @@ Typical configurations for these config files are:
     "build": "cross-env NODE_ENV=production webpack --progress --hide-modules"
   },
   "dependencies": {
-    "element-ui": "^1.0.0",
-    "vue": "^2.1.6"
+    "element-ui": "^1.4.0",
+    "vue": "^2.3.0"
   },
   "devDependencies": {
     "babel-core": "^6.0.0",

examples/docs/zh-CN/installation.md

@@ -3,8 +3,12 @@
 ### npm 安装
 推荐使用 npm 的方式安装，它能更好地和 [webpack](https://webpack.js.org/) 打包工具配合使用。
 
+:::tip
+注意：这里是 1.x 的文档，因此使用 npm 安装时需要添加 `legacy` 标签。
+:::
+
 ```shell
-npm i element-ui -S
+npm i element-ui@legacy -S
 ```
 
 ### CDN
@@ -17,6 +21,10 @@ npm i element-ui -S
 <script src="https://unpkg.com/element-ui@1.4/lib/index.js"></script>
 ```
 
+:::tip
+我们建议使用 CDN 引入 Element 的用户在链接地址上锁定版本，以免将来 Element 升级时受到非兼容性更新的影响。例如，如需锁定版本为 1.4.8，则 CSS 和 JavaScript 文件的地址分别是 `https://unpkg.com/element-ui@1.4.8/lib/theme-default/index.css` 和 `https://unpkg.com/element-ui@1.4.8/lib/index.js`。
+:::
+
 ### Hello world
 通过 CDN 的方式我们可以很容易地使用 Element 写出一个 Hello world 页面。[在线演示](https://jsfiddle.net/hzfpyvg6/18/)
 
@@ -37,7 +45,7 @@ npm i element-ui -S
   </div>
 </body>
   <!-- 先引入 Vue -->
-  <script src="https://unpkg.com/vue/dist/vue.js"></script>
+  <script src="https://unpkg.com/vue@2.5/dist/vue.js"></script>
   <!-- 引入组件库 -->
   <script src="https://unpkg.com/element-ui@1.4/lib/index.js"></script>
   <script>

examples/docs/zh-CN/quickstart.md

@@ -4,7 +4,7 @@
 
 ### 使用 Starter Kit
 
-我们提供了通用的[项目模板](https://github.com/ElementUI/element-starter)，你可以直接使用。对于熟悉 [cooking](https://github.com/ElementUI/element-cooking-starter) 或 [Laravel](https://github.com/ElementUI/element-in-laravel-starter) 的用户，我们也准备了相应的模板，同样可以直接下载使用。
+我们提供了通用的[项目模板](https://github.com/ElementUI/element-starter/tree/1.x)，你可以直接使用。对于熟悉 [cooking](https://github.com/ElementUI/element-cooking-starter) 或 [Laravel](https://github.com/ElementUI/element-in-laravel-starter/tree/1.x) 的用户，我们也准备了相应的模板，同样可以直接下载使用。
 
 如果不希望使用我们提供的模板，请继续阅读。
 
@@ -42,8 +42,8 @@
     "build": "cross-env NODE_ENV=production webpack --progress --hide-modules"
   },
   "dependencies": {
-    "element-ui": "^1.0.0",
-    "vue": "^2.1.6"
+    "element-ui": "^1.4.0",
+    "vue": "^2.3.0"
   },
   "devDependencies": {
     "babel-core": "^6.0.0",