Delegate challenges list to Host app

[sadanandpai]

Title: Delegate challenges list to Host app

Issue No.: #377 Code Stack: E2E stack

Checklist:

• [x] I have mentioned the issue number in my Pull Request.
• [x] I have commented on my code, particularly in hard-to-understand areas
• [ ] I have created a helpful and easy-to-understand README.md
• [ ] I have updated the Index.html file for my contribution

Description:

• Works end-to-end locally with single URL access using ENV
• Host app takes responsibility for challenges

Clean up activity is planned for future PR once found stable on prod

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