docs: embedding in websites add systemVariables (en/zh_CN) (#736)

* docs: embedding in websites add systemVariables (en/zh_CN)

* docs: embedding in websites add conversation_id in systemVariables (en/zh_CN)

en/guides/application-publishing/embedding-in-websites.md

@@ -22,6 +22,13 @@ window.difyChatbotConfig = {
     draggable: false,
     // Optional, The axis along which the button is allowed to be dragged, default is `both`, can be `x`, `y`, `both`
     dragAxis: 'both',
+    // Optional, An object of system variables that set in the dify chatbot
+    systemVariables: {
+        // key is the system variable name
+        // e.g.
+        // user_id: "YOU CAN DEFINE USER ID HERE",
+        // conversation_id: "YOU CAN DEFINE CONVERSATION ID HERE, IT MUST BE A VALID UUID"
+    },
     // Optional, An object of inputs that set in the dify chatbot
     inputs: {
         // key is the variable name

zh_CN/guides/application-publishing/embedding-in-websites.md

@@ -35,13 +35,19 @@ window.difyChatbotConfig = {
     draggable: false,
     // 可选项，允许拖动按钮的轴，默认为 `both`，可以是 `x`、`y`、`both`
     dragAxis: 'both',
+    // 可选项，在 dify 聊天机器人中设置的系统变量对象
+    systemVariables: {
+        // 键是系统变量名
+        // 例如：
+        // user_id: "YOU CAN DEFINE USER ID HERE",
+        // conversation_id: "YOU CAN DEFINE CONVERSATION ID HERE, IT MUST BE A VALID UUID"
+    },
     // 可选项，在 dify 聊天机器人中设置的输入对象
     inputs: {
         // 键是变量名
         // 例如：
         // name: "NAME"
     }
-
 };
 ```