Setup new heroku app instances for PR testing and reviewing

[thomaszhouan]

More heroku app instances are needed due to frequent update and testing.

• [x] New chatbot accounts for testing
• [x] New heroku repos for testing deploy
• [x] Test deployment

[thomaszhouan]

~The solution is to use heroku review app, which will deploy automatically whenever there is a PR open on GitHub.~

[thomaszhouan]

LINE chatbot instance cannot be generated automatically. Alternative solution for PR reviewing proposed.

[thomaszhouan]

Close since done.