feat: also expose siteData in enhanceApp.js

Author: yyx990803

lib/app/app.js

@@ -76,9 +76,9 @@ export function createApp () {
   })
 
   const options = {}
-  
-  themeEnhanceApp({ Vue, options, router })
-  enhanceApp({ Vue, options, router })
+
+  themeEnhanceApp({ Vue, options, router, siteData })
+  enhanceApp({ Vue, options, router, siteData })
 
   const app = new Vue(
     Object.assign(options, {