docs: 📚️ usage from CDN links

README.md

@@ -72,7 +72,10 @@ For production, we recommend linking to a specific version number to avoid unexp
 **Step 2**: render nodes and edges.
 
 ```ts
+// import from node_modules
 import { Graph } from '@antv/x6'
+// or use the global variable `X6` exported from CDN links
+// const { Graph } = X6
 
 // Create an instance of Graph.
 const graph = new Graph({

sites/x6-sites/docs/tutorial/getting-started.en.md

@@ -2,8 +2,8 @@
 title: 快速上手
 order: 1
 redirect_from:
-  - /en/docs
-  - /en/docs/tutorial
+  - /zh/docs
+  - /zh/docs/tutorial
 ---
 
 ## 安装
@@ -97,6 +97,8 @@ const data = {
 
 ```ts
 import { Graph } from '@antv/x6';
+// 使用 CDN 引入时暴露了 X6 全局变量
+// const { Graph } = X6
 
 const graph = new Graph({
   container: document.getElementById('container'),

sites/x6-sites/docs/tutorial/getting-started.zh.md

@@ -97,6 +97,8 @@ const data = {
 
 ```ts
 import { Graph } from '@antv/x6';
+// 使用 CDN 引入时暴露了 X6 全局变量
+// const { Graph } = X6
 
 const graph = new Graph({
   container: document.getElementById('container'),