[demo] [s]: remove unused file

packages/create-portal-app/demo_index.js

@@ -1,9 +0,0 @@
-const copy = require("./helpers/copy");
-const install = require("./helpers/install");
-const path = require('path');
-
-(async ()=>{
-  const root = [__dirname, "templates"].join(path.sep);
-  await copy(root,"Datahub")
-  await install("Datahub", true);
-})().catch(e=> console.log(e));