docs: improve demo translating

webpack.config.js

@@ -1,3 +1,5 @@
+const { join } = require('path');
+
 module.exports = function () {
   if (process.env.BUILD_TARGET === 'package') {
     return {};
@@ -8,5 +10,10 @@ module.exports = function () {
     entry: {
       'site-mobile': ['./docs/site/mobile'],
     },
+    resolve: {
+      alias: {
+        '@demo': join(__dirname, 'docs', 'site'),
+      },
+    },
   };
 };